What do you guys (developers) do during non competes?

I am a C++ developer and just started my 1 year non-compete.

Curious what others here have done during this time. I am thinking of exploring ML inference optimization or some other technically challenging work, preferably involving C++.

Would love to hear what you guys worked on or explored during your non-competes (I don't think I can take break for more than a couple of months).