Thanks for the info. I was only going to seperate /home onto a different partition, but then I took a look at sudo du -hs /nix and saw it was 17GB by itself on my current laptop. I was aware of the gc daily thing since i have automatic updates enabled, but I was not aware of the other two storage optimization things.

I am a pretty standard desktop user, but i do need some dev tools like androidsdk, flutter, java, and rust.