Here is the mod https://github.com/ishlandbukkit/RaiseSoundLimit/
Here is my crash log https://mclo.gs/hVTpOtp
It crashed right before loading the main menu of Minecraft.

Given the crash report, and that it mentions carpet.mixins.json:SoundSystem_cleanLogsMixin, the mod is likely incompatible with the cleanLogs carpet setting.

I never use that option, so can I just disable it some how?

Not easily though... You could remove the mixin references from the carpet.mixins.json file inside the mod jar, but this would actually need a change in Carpet in order to work properly (which I think would be either changing the priority so Carpet loads before and therefore finds the method, or making it not required).

If you want to try, you would need to open the JAR file, edit the carpet.mixins.json file to remove the line with SoundSystem_cleanLogsMixin (one of the last ones in the file) and then it should work, in theory. You would need to redo those steps after a Carpet update until that is fixed though.

In theory, I could remove it before I compile the mod.

I wonder if Gnembon could implement something similar RaiseSoundLimit. I don’t know how to code so I don’t really know if it would be easy or not.