Yeah, totally resonates with my experience. I went further and have several, completely independent side projects. That is: Build a game with a custom engine (doing that since 2019 now), do some stuff on my car, do some stuff on my pc, write a blog post from time to time or simply just play games. And I'm alternating between them, as my brain pleases. That, personally, gives me the counter-balance to my job as a software engineer, where I HAVE to stay focus on ONE thing for several hours/days.