Notice an enjoyment that steadily nourishes you. Exciting whims can come and go, but some are deeper or more nourishing than others.
If it seems eclipsed at the moment, poke around, try different things, see if it matures and deepens into something nourishing. It may masquerade as “a hobby,” but it may really be much more. Then do what it tells you to do, and do it often. Been tinkling around on a piano? Give it a chance! I know a woman who wouldn’t give up until she could change a flat in ten minutes!
(Don’t be surprised if someone thinks you’re weird for really getting in to something that’s uniquely You.)