I keep seeing posts about people starting new hobbies, learning languages, gong on diets etc.
This is fantastic if you want to do it and have the time etc. However, a period of massive anxiety and uncertainty is possibly not ideal to start something new. You could be setting yourself up to fail.
It's OK to stick with the familiar. If you're lucky enough to have nice food available, enjoy it. Have a drink if you fancy one. If exercise makes you feel better, great, but a local walk is fine if you can't get motivated for a complicated workout. Children can be plonked in front of a film or a while. Cuddle them, read to them but you don't have to teach them for 10 hours a day. Good enough is good enough. If the house gets a bit dusty, that's OK. No need to deep clean everything in sight. Mediocre is all most of us can manage right now. Be kind to yourself.