@souldessin, It’s an interesting topic, but I was not able to think what would be my answer.
But what @Bazzawill wrote at the start rang a bell with me: I don’t have a particular hobby, but I tend to get find interest in different topics (rat-holes!), and being old now (47! :-(), I’m already started to drift away from some of them.
I was (I guess I still am) a Linux enthusiast, but nowadays I’m not “practicing” anymore, as I have different responsibilities.
I like programming, but I’m also not practicing.
I like information security, … same!
I would like to draw, play music (different instruments), not much time to do all, and no solid goal to chase (do I need a new year resolution?!!)
I like reading SciFi, (barely managing now to slip something in, in listening, with the time needed to listen to the different podcasts I’m trying to follow).
It’s a mess!
I’m not diagnosed with ADHD, but I won’t be surprised to know I’m on the spectrum.
The last thing I will add: I like strategy games, and also not having enough time to pursue, but lately I had the chance to play Frostpunk, and it was quite interesting!