Instead of questioning whether or not you should be maximizing your productivity at this time, it might be more useful to check in with how you feel.
If you spend 3 weeks watching netflix, how will you feel?
If you spend 3 weeks working yourself to the bone, how will you feel?
Chances are you won’t feel great doing either.
As much as it is good to rest you’ll also feel good doing things. Whether that is one task a day like reading x chapters of a book, decluttering a room in your house or starting an online course.
But you don’t need to compete or try and milk this time for all it’s worth. It’s healthy to rest and it’s healthy to do things. You just need to figure out what works for you and go with it.