Suggestions

I suggest making a command like /kill top to display the top player who have the most kills, /death top to display the top deaths, and /player top to display the best players according to there ELO rating.

You should also add lifesteal since it is very fun to play and very competitive

Add a new server like a practise one where everyone can pvp add like fireball pvp and more everyone will love it and be active you can get more members from it and i will advertise the server if you do it you can get upto 1000 players just from that!. Hope this helps

As you see there's a mod called the carpet mod it fixs many problem with the minecraft textures. like when you craft a skull charge banner patern it looks great when you place the banner down or see it in the inventory. but looks awfull when applied to a shield. it doesn't look same. It looks detailed when in the inventory but looks low detail when applied to a shield.

please make getting mob hunt event keys like this : 1st place-3 keys
2nd place-2 keys
3rd place-1 key
its random now like it doesnt matter even if u get 1st place you can get less keys than 3rd place or less than 2nd place

Armor stands with arms should be added in survival