@actuallyautistic
What are some less obvious ways you engage in your special interests? Like, if your interest is a TV show, you can watch it - but you could look at screenshots from it, or read fanfic about it, or... what else? Or if your interest is a sport, you can play it, but what about on days when you need to rest? I'm looking for ways to have more special interest time without that always meaning the same activity and I'd like to hear about what's worked for you.
Yes, all of that, plus more. Writing fan fiction, just sitting and pondering, online forums.
I'm a Trekkie, and I stumbled across a site that had the extrapolated external dimensions of a starbase, so I calculated the internal. Took 2 years to refine it, off and on.
Those things are (would be) HUGE! A potential population of about 2,000,000 people. Deck space measured in hundreds of square miles.