This turned into a story, tldr at the end.
I’m in a similar boat, or have been. I’ve got a new hobby - civic engagement - but it mysteriously looks very similar to my actual work; lots of reading, writing, planning, coordinating.
It isn’t healthy to only be thinking in one particular way all day every day; I tend to want to work 10-11.5 hours at my day job, and then do a few more hours of other work (usually reading some type of report, annotating some sort of law/policy, or writing some sort of email).
For a while I was baking and learning music. It was fun to learn something totally new; being able to train myself to operate my hands in a new way was pretty cool. Unfortunately I became too busy and couldn’t sustain it.
Solutions:
- go to the movies. Short time commitment, usually engrossing content, gets you thinking in a different way. Theaters are open again and they’re putting out movies again (at least in the US). If the movie is really good, I forget myself and stop thinking analytically. If the movie isn’t so good, at least I’m thinking about that (‘the soundtrack choice isn’t great in this scene’, ‘having her force herself back to life and into this ship after clearly dying space doesn’t make any bleeping sense’) instead of API design or policy design.
- Games: this is a classic answer, but don’t feel bad if it doesn’t work. Once I’ve got something I care about/see value in, I can’t be motivated by video games. Great if you’re burnt out though.
- Drugs: sorry this isn’t a great or PC answer, but it’s the truth for myself and a lot of other people. If I really want to forget work, there are many options; alcohol is quite popular as is cannabis. It might seem like only bad people use cannabis, but realistically it is more common than you’d think (on the US west coast at least). I’m a workaholic so I have trouble enjoying time off, and that helps. Also makes sick days more bearable. I really hate being unable to work productively even though I want to; something other than sobriety can take the edge off. Drugs harder than cannabis not recommended. Again, not an amazingly healthy option, but it’s worth acknowledging the ugly truth.
- Human needs: if you are single and don’t want to be, work on addressing that while you can; evidence suggests that on your deathbed, you will regret not pursuing human connection.