1.
Damage types are balanced with monster defenses. You can't just pop up more types.
Here's a table for reference http://wiki.spiralknights.com/Damage/Monster_resistances

Let's not overcomplicate such simple system.

2.
Sure, everyone wants new monsters. But any ideas on how to make them unique?

3.
Lockdown is the most balanced PvP possible. (yeah, laugh at it)
With a single flag or a deathmatch, you spam mist bombs and polaris at a single chockepoint and be done with it.
Like campers on a FPS. Both teams will be left in a stalemate. Whoever tries to take the offensive loses.

Current PvP forces people to be constantly moving and hold multiple points. Abuses still happen, but much less severe.

"From my point of view the current arsenal is small people easley make it to 5* gear ...
My opinion is to add more kind of gears n sets n why not increasing its level like 6*7*...n adding more types of damage"

We don't need 6* and 7*. You can't just say "I want 6* and 7* gear add it now kthxbai"

"Any one can explore the hole SK envirement in two weeks max I suggestion to expend it n make it hard to explore
+adding much more new monsters "

What kind of environment? What kind of monsters?

"In lockdown we have only one kind of PvP capture the point why we don t made more kinds like capture the flag,team death match , FFA ..."

No.

"I want everyone s opinion to improve Sk share this with your friends n G mates in SK n tell me if you have additional ideas"

First, these ideas aren't going so well. Second, telling people to give in additional ideas for this thread is NOT how suggestions work.

Clearly, you need to learn more about the game.