It sounds like you're working 8 hours/day and unwinding the rest of the time?

I never had energy for side projects with a full-time job. Just because some do doesn't mean it's for everyone.

Maybe there are higher value ways to relax than doom scrolling but I don't think being "unproductive" beyond 8 hrs/day is a bad thing.

Hopefully you can also find work that is stimulating and gives that sense of accomplishment.