resize2fs or a bootable gparted stick will help. And yes, it’s all on the Arch Wiki.

Long time musician here!

Back in Reddit days I did prawl through music-making related communities, but found that discussion tended to stick to pretty trivial spheres. Figured that general music maker communities don’t work. You want jazz drumming / pure data / microtonal techniques level specialised communities to keep it interesting. Otherwise it’s just ‘recommend a beginner-friendly daw’ over and over.