[hengheng]

Depending on how you build it, you could run homeassistant next to your smb, which lends itself to all sorts of add-ons such as calibre-web for displaying eBooks and synchronizing progress.

Of course, gitea and surroundings, or similar ci/cd can be a fun thing to dabble with if you aren't totally over that from work.

Another fun idea is to run the rapidly developing immich as a photo storage solution. But in general, the best inspiration is the awesome-selfhosted list.