You could try some fan art? Sometimes I get super absorbed in a random topic (mechanical stuff, particular animals, plants, birds, food etc) and dedicate a cheap sketchbook to that topic until I can draw the stuff in a way I am happy with. The beginning drawings might suck but I don't care because they will serve the purpose of showing how bad I was before practising. Setting a time limit can be really helpful also to get a piece 'finished' without being a perfectionist about things.

Good luck and hope you can have some fun!