Okay quite a few things to be listed here.

Energy Crisis:

This is easily the most debated topic let's start from here.
-Dynamic energy costs.
This would make the game more viable for new players to get into it. and for old players to survive. Tier 1 gates 5 Energy Minor gates in tier 1 levels 1 energy. Tier 2 Would remain about the same. 10 energy gates but 2 energy minor gates. Tier 3 would be 20 energy gates 3 energy minor gates.
-Removing The crown tax on buying crowns.
This would make marketing energy more viable. Allowing more people to buy low sell high sort of stock market energy
-Removing or atleast minimzing use of energy on alchmy.
I really think energy on alchemy is a tad too expensive. Think about it. Your cheapskate new players will have to sacrifice 2 days of game time just to use the energy to craft their cobalt set to make it to tier 2. I think all alchemy ce pries should be sliced in half.
-Really rare chance for monsters to drop
Optional just thought it would be cool

Game Suggestions:
-Bonus Crowns awarded on most kills/less deaths
Adds a little competetive flavor to the game.
-See damage
Allow you to see other player damage and monster on monste damage
-Npc that unbinds your equipment from you for a CE Price
nuff said. Price could be based on stars say 20 CE Per star making 100 max
-Npc that changes your favorite color selected when you created your character for CE
This one would do great at sucking CE I wish i was blue right now
-Customizeable Guild Hall
Just an idea not a necessity.

Weapons and Armor Suggestions:
-Tier 4 Swiftstrike Upgrade
Swiftstrike buckler is just an amazing shield. i wish it could grow just like the rest of my awesome gear
-Cutter series: Few invincibility frames while using charge attack OR Cbarge attack can be cancelled at any time with shield.
-Drastic improvement to Spur Series
Spur series are beautiful swords. But let's face it. The charge strike is USELESS. Not only does it take forever to cast, it's really hard to hit with, it's slash doesn't do damage or is just impossible to connect. and it has mediocre range. Heres my suggestions

Spur: Charge attack pierces through enemies. and doesn't step back to cast/casts faster. You can run and attack without stopping to do attack animation. Walk speed is significantly slower while attacking kind of like blaster guns
Arc Razor: All of the above. Longer range charge strike, twice of actual charge attack
Winmillion: All of the above. Charge strike shoots a really fast disk that pierces all enemies and it has a chance to freeze
Wintrillion: New 5* Recipe for Spur series. Each hit shoots out 3 disks in a cone pattern \ | /. Small chance to cause medium freeze with each hit. Charge attack: Same as winmillion but also 3 disks in a cone shape \ | /

That's all for now!