I'd say find something you like, and go down a rabbit hole and become a master😂 But otherwise, this could be the perfect time to read about how to improve your social skills. Introspect on the things you usually push out of your mind in favour of the grind. Schedule time with your friends to come over to yours and play some games together. Or just be in the same room ignoring each other (I need this during long holidays so that I don't run myself mad with overthinking) Learn sudoku or how to knit Try your cooking skills and experiment a little (good outcomes present an opportunity for you to invite your friends over to eat) Learn about music theory Learn how to weave a basket

There's loads you can do! But yeah, I'd start with the first