I have a lot of personal projects, some big, some little. Some focus around my daily job and the things I find interesting but are too farfetched or risky in an R&D sense to actually focus on. Others are more personal or related to my hobbies.

For example, I have a water level sensor in my RV that's broken, mostly because of bad design. As a personal project I'm designing a drop-in replacement that's (hopefully) more reliable.

Other times I make contributions to open source projects that I use and like, for example to fix bugs or add features that I want.

These are mostly evening activities though, during the day it's mostly hobbies, like diving, hiking, motorcycling and such. You can never have too many hobbies :)

And sometimes I don't have the energy for any of it and just sit and read Lemmy or watch a movie with my fiancé, all mood dependent.