Add more gamemodes for example: Boxing, Combo, Spleef, Sumo, Bridges, Build UHC, and finally Stick Fight. Change Elo system and kb (knockback) Change NDB (NoDebuff) add pearl cooldown, and a better Potion animation.
2. Unbans
Try to unban most of the people that aren't banned for cheating.
Add other gamemodes in /pvp like bridge, boxing, Combo, spleef, and stick fight. These gamemodes are the most played in pvp servers! Re-create NoDebuff for example add pearl cool down, and better Instant Health II animation. Maps, add larger maps, that won't get you FPS(frames per second) drops.