Watching movies. There’s so many movies, both good and bad. Sometimes bad movies are fun too, especially horror.

Others have mentioned video games. I’ve gotten into emulation using Batocera. Can be installed on old hard drives/raspberry pis.

Depending on your space/climate, gardening and/or growing mushrooms.

I’ve been looking more into home improvement and homesteading.

I also just tend to get fixated on random things that interest me and go down rabbit holes.