Suggestions

/craft [item] max/all

instead of having to know exactly how much an item can be crafted, /craft [item] max/all.
It just crafts an item as much as possible.Or theres no more inventory space left.

Lag reduction improvements.Both fps and tps

Fps:
Prevent the spawners from being rendered in.This is reduce unnecessary fps lag by not rendering the mob inside spawners,and cause massive fps lag.Plus,most,if not all, player made mob grinders have been categoried and spawners are covered so the mobs can spawn inside the boxes.
TPS:
/TC or /trashcan.Basically /ci(clearinventory) but we put our items we want to be cleared inside.Having th.. See more

Warp Bossfight

Make it so that you have a limited amount of time to pick up your stuff in /warp Bossfight.Noone likes random people just stealing all your armors and weapon after you died.It benefits everyone.You won't have to fear to die in bossfight again

/friends

Allow you to see if the player your friends with is afk or not.very simple.

Vote party and server restart

Vote party are a rare event now that the player count has dropped.most of the time when voteparties are about to happend,a server restart will reset the vote needed for a vote party.This basically makes vote parties on some dead servers like op skyblock and op survival very hard and rare event to happen