Hi, to unswer your question: the activities you choose to do during lockdown are very personal. The only universal one I'm not doubtful about recommending is meditation.
Personally I read a lot; science articles, philosophy, chess... I also study using youtube tutorials and watch some travel documentaries, to compensate being locked in.
I hope it was hopeful, and good luck.

The t-shirt has a very cheerful vibe, I like very much.