You should disable world-folder maps and replace them with arenas. So the server isn't simply full of words. Otherwise, the plugin appears to be promising.

Good resource. I want to give you some suggestions if you accept them. You can add per-arena kit system. So you can add /joingame <kit> command and players can join spesific duels. You can add scoreboard systems, changing the texts, changing the start timing, victory command section, green name for us, red name for enemies, placeholders for win count, lose count, kill count etc.

good plugin, but can be better, why you don't do something much much better than a normal duels plugins, like add bedwars, sumo, uhc, combo pvp, and also like a duel minigame, where you can use signs for joining