The most interesting part to me right now is running Zig on a microcontroller, since that's something I really wanted to do this year (like a new year's resolution thing). I've been interested in Zig for a while, but I've never done any serious learning/programming with it, so I might look at your OS repo to at least gain some inspiration on how deploying to a microcontroller works.
It also seems like it would be a really good way to learn embedded electronics in general, since if I wanted to learn something new, eg lower level network programming, I could make and program a network card, or usb hosting, or anything like that.
I'll definitely try to do it one day, once I've finished all my current projects haha
The best thing that helped me: Force myself to one single project only. And if I really don't want to do the current one, do a ___really___ small one, that's pure fun. I have to remind myself of that again and again, but it helps
I'm also having ADHD but you can get help with the focus problem ;)
It's incredible to work for many years on the same thing and it's so pleasing to have steady progress.
So: Go, start building a vision for your cyberdeck! Having a clear goal helps you working towards building it, and you cam embrace the ADHD by jumping around between the many aspects of such a project.
sw design, hw design, visual design, mechanical design, handcrafting, soldering, programming, making websites, asking people, ...