I think when I did /clear to kill all the nearby mobs it broke my skills, I cannot gain levels I'm on level 0 and when I try to use commands to gain levels it says I have no Attribute levels. 1.17 Medieval Curse Forge.

Assumed as Minecraft 1.17.1 and hence not applicable to the latest release.

Hi there,
Just to confirm, you are playing on Minecraft 1.17.1 yes?
Thanks.