Should be interesting.
I haven't kept the closest eye on this - rumor is they're planning to port more of their games to competing platforms, maybe allow 3rd party Xbox hardware, and phase out most physical Xbox games, right? Or am I way off the mark?
SNES was my favorite growing up, but over time my nostalgia for the GameCube has really kicked in! I think it might have to be my answer now.
Generally I read HackerNews and Lemmy communities like this one. Once in a while interesting projects will get highlighted.
But for the most part, once I identify a need, I'll look through alternativeto.net and see what the popular open source options are.
First step definitely would be to identify specifically what you'd like to improve. To say 'tech skills' is to cast a wide net. If you want to learn all sorts of things that's fine, but to get started with that and identify resources you have to be at least temporarily specific.
Are you thinking along the lines of system administration? Networking? Programming? Hardware setup/troubleshooting?
You didn't rule it out, so my first thought is: play video games! It's certainly on the line between consuming something and learning to do something. Some individual games can be a whole skill to study and hone for years (eg, learning a fighting game or a speedrun, etc etc)
Spirit of the question though, that would probably be considered content.
Other ideas, most already covered by other comments: art, photography, music, writing, programming, cooking, woodworking, or learning a new language.