Not what should you do. Not what needs to get finished. Just what might help you feel a little more like yourself today.
First
How are you arriving today?
Some things really are better together
What would feel easier if someone came with you?
Maybe you already know what you enjoy. The harder part is finding someone to do it with.
Or maybe it's been so long since you've had time for yourself that you're not even sure what sounds fun anymore. Start with whichever of these feels closest.
You don't need to arrive with a hobby.
You don't have to know what your "thing" is. Sometimes you find that out by being around other people, hearing what they're trying and saying, "Actually, I'd come to that."
Maybe the first thing you need isn't a new hobby. Maybe it's people to discover one with.