If you get to relive lockdown, what will you do?

For Context, OP just finished 12th. Got offers from foreign unis for Mechx, college starts Feb 27' and this year's gonna be my gap year. I'm afraid idk how to best utilize my time. What I've thought out currently is a research article that I'm working on and planned out a fee tech projects, some open source contributions to my friends' projects, some tinkering with Arduino I'll buy around May. Also tried my hands on a paid writing internship, got hired but didn't join and now Idk what to do for the rest of my year. All I know is that I've got a kashmir trip planned for this summer with my family. Might as well try to join a swimming club. I also started reading novels recently; I mostly like books like 1984, The King in Yellow, Blood Meridian, pretty mainstream books I believe so any recommendations for alike books are welcome. Also started working out again recently, I got a home gym and don't plan to join any public one yet because my schedule is pretty fked these days, I sleep either 12 hours a day or pull all nighters just to see rain and thunder from my balcony. I genuinely don't know what more can I do with my time, also been thinking about learning a new language coz I mean 10 months/300+ days is a crazy amount of time I'm sure.

TLDR: In my gap year before college, need suggestions on what to do with my time.