In terms of side projects, I’ve deliberately curated a smaller set that meets multiple criteria. Social connection, simplicity and elegance, and the ability to start and stop at will.
At work I am always looking for ways to do more than one thing at once. Learn a new skill. Teach something. Solve a small problem. Make myself feel good. Take the solution to the next level.
I think it’s okay to want to always be honing and advancing. Humans are always seeking lower energy paths. Maybe you just need to expand the scope of the skills you’re seeking. One of the most valuable skills in my work is the ability to stop and think about what I’m actually trying to do. That is honed through stopping and observing (meditation).