Game launches when removing Toolbelt or BetterModsButton, I'm assuming it's a conflict between the two. Attached is the latest log before removing toolbelt.
latest.log

KeyBinding errors like that happen when there has been another error beforehand. You'll see the "Cowardly refusing..." messages there. ToolBelt isn't the cause, but rather the victim.

The most likely source is this:

[08Dec2024 17:25:41.429] [modloading-worker-0/ERROR] [net.neoforged.fml.javafmlmod.FMLModContainer/LOADING]: Failed to create mod instance. ModID: croptopia, class com.epherical.croptopia.CroptopiaMod
java.lang.NoClassDefFoundError: com/epherical/epherolib/libs/org/spongepowered/configurate/serialize/TypeSerializer

but there's some mixin errors higher up.

Someday I will get around to protecting my keybinds so that loading errors don't blame my mod instead of showing the real error.