The simplest one of them all:
backcap the enemies home point when you notice your team can't regain control of your part of the map.

Also very underrated is not being an idiot.
The times I see a whole team run DOWN towards 3 strikers waiting for them are plenty.
Few people seem to realize there's usually a way up as well.

Heres a decent tactic:

Wear a set that doesnt have too many accessories. It psychologically affects the enemy into thiking you are not as much of a threat, and they wouldn't try as hard to kill you.

How do I know this? Just think: Iff you saw a naked Snarbo guy, and a Snarbo maxed out with Shadow D wings, Hacked Aura, Spike Mohawk, and Crest of winter, who would you assume is better? It would have to be a quick decision, since in the heat of things you do not have much time to think.

Disregarding name or rank, most would immediately think the maxed out snarbo is better.

This is an extreme example, but something as simple as a mohawk or wings or vertical vents affects the attacker subconsciously, and forces them to play a bit more defensively.

Talking about simple at-a-glance decisions made by LDers, accessories typically correlates to "better or more dangerous player". And because of this, they play smarter or harder to kill them.

Be annoying enough to draw attention to yourself and maintain that attention for as long as possible, especially if your team is on the losing end. The more people focused on you, the easier it is for teammates to either shut down the push, or slip by to help out on another point. Conversely, if you can maintain this when your team is winning - either by fighting on their homepoint, or making sure none slip past you, then go for it. It's more useful in RLD than in GvG, since RLD rarely has more than one or two people coordinating with each other, but if you can capitalize on an enemy team in GvG with it, then it's a bit more effective since your team's also likely to be a bit more cohesive.

Note: I'm not saying camp their base if you're winning on the offensive. Rarely can a striker - hybrid or not - hold their own in a freshly spawned wave by standing right outside of their base. Hanging back far enough to where the enemy team takes different routes to mitigate the swarming factor, but close enough to be a direct obstacle between them and the base point being captured. There's a difference, and if you don't know it, don't do it.

Be smart about your kills - keeping an eye on when your own teammates respawn is a good indicator of when the enemy team has also respawned. Dropping your opponent within the first few seconds of that respawn is going to force them to sit out for upwards of 15-20 seconds. This can give you enough time to make the big play on capping a point, especially if you're smart about who you drop - killing the kid in 4* Cobalt armor is cool, but shutting down the stronger players with this should be your goal.

Don't brute force your way through everything - too many times I've seen strikers run in on a point from below and land one swing with a Gran Faust on multiple people, and then get subsequently mopped up because they went in half-cocked. It's better to have them scatter off the point than have them all swing back at the same thing, so force the scatter, then fight accordingly. You're preventing the capture of the point, and with them scattering even for a couple of seconds, you should be able to fight your way around them, through them as they close in, whatever.

Lastly, force your opponent to overextend their class mods. If they're striker, make them run out of boost. Guards? Break the shield, or goad them into dropping it to land a sword swipe. Recons? Either restrict where they can attack you from, or watch for footprints on maps that allow for it.

+1 for "backcapping" (capping the point closer to the enemy base).
Would also like to add the reason that by being there, it can split the enemy team away from the group that's camping your team, meaning they have a better chance to fight back. And if not, then the ones who are more likely to be there are the ones on the enemy team that have died (so they tend to also be the weaker links).

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Decap when you're losing
Instead of completely sitting on a point and trying to fully cap it, try decapping (removing enemy control of a point) instead. By decapping, you can extend the game long enough to make a comeback.

ex:
If your team has 350 points and enemy team has 440 points and control 2/3 of the points, they are gaining 8 points every 5 seconds, versus your team's gain of 5 points every 5 second (so relative to you, they make 3 points per 5 seconds).
If you decap 1 point so both teams own one control point, they're still closer to the end of the game but they don't gain any larger of a lead.
If you completely remove their control and only own one point, the game doesn't get closer to ending AND your team starts starts to catch up by 5 points, letting you close the gap and maybe even overcome it.

Numerically, it's the better choice. Strategically, just like backcapping, it can split up the enemy team and pull back the other team's offense so the rest of your team can cap.

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Here's a crazy one:
Read your allies on the minimap for hints about what the enemies are doing
You can make really good guesses about situations from how the teammate dots move on the minimap.

a- If they're on a point and suddenly they start doing start-stop movements, they're probably boosting+stopping to slash: enemies are there, and they're in a fight.
b- If a teammate that was moving around has stopped moving, and someone just died, that's the one.
c- If you can see which teammate went off alone in some direction, watch their health because if they start taking damage, you'll know the enemy's there. I tend to tell my teammates which points I'm on for this reason as well. It's usually something like "I'm at 1. If I die, then I've lost the point". If they read it, they can react before the point's even lost.

- If you're using a non-striker class, you can combine b/c to determine if there are enemies ahead.

@Rezzler +1

Something I stress a lot. If the enemy has two points and you have one, they're getting a steady 3 point lead per tick. If you uncap both points rather then fully cap only one, you will gain a 5 point lead per tick by having a single point and the enemys point increase will stagnate. Naturally you'd want to fully cap both points, but with people fighting and dieing there is a slight wave motion and push back on the caps throughout the match - provided the enemy team is not just shut down. Uncapping both points is faster in a sense that you'd be gaining an advantage per tick, but by uncapping you also prolong the game since the race to 500 or 900 has slowed down.

Either way, if you have a chance to deny the enemy team any points even temporarily do it. You'd get a great lead as it takes time to recap - and also spreads their team out as it's near impossible to coordinate in RLD on the fly. Reading your teammates is just as important as reading the enemy, as typing takes ages in a game where you can die before typing "brt".

This method works ok for GvG, but it's more viable for RLD since an individuals independant decision can make a huge difference in a game where there's rarely any vocal coordination.

Rotten-Tomato has told me a useful strategy.

Surprise.

Not the "go under him and smack him", or "go recon". Do something that the enemy will not expect. For example: You are guard bombing, happily dropping haze bombs wherever you go. It's a good tactic to keep your opponents away. But sometimes they find a way to break your defenses. You are helpless - if you don't know this trick.

While guard bombing, ALWAYS bring a GF.

The enemy will think that you are the average bomber stereotype, who only uses bombs. They will get close and exploit your weakness. If you pack a gf with you. You will have the element of surprise on your side.