It is an issue with Warriors Of World (gdmef-1.1.5-forge-1.20.1.jar)
Check for the dependencies:
https://www.curseforge.com/minecraft/mc-mods/warriors-of-world/relations/dependencies
or remove this mod
Referring to the crash, the server is down due to client-side-only mods
Remove fpsboostremake from your server
If this is still not working, add the new log - maybe there are some more client mods