Yep I’m in exactly the same boat. I think I’ve largely decided that tech is just a job now; my motivation to code outside of work was tied to also somehow enjoying doing it at work and now I don’t anymore I also stopped doing it for fun.
So I’ve replaced advent of code with various other stuff, music, woodworking, books, the great outdoors and while my life is less rich in technology it’s becoming much fuller in other ways.
For me, coding outside of work becomes unsustainable as you age. It's not that you can't, it's because you realise there's more to life than staring at a computer screen. I love coding, but it's also good to go outside sometimes.
Recent years (40's) I've been on a building spree of sorts for my own projects[0]
I'm my 30's, a lot of energy went into home improvement projects, establishing a garden, and young kids. Now I find a lot of time and energy left for my own passion projects.
So I’ve replaced advent of code with various other stuff, music, woodworking, books, the great outdoors and while my life is less rich in technology it’s becoming much fuller in other ways.
I think I prefer it this way.