I would learn to sing, fly a plane, restore a car, dive deep into music writing and production, Id learn After Effects, make fan edits of my favourite films, I'd grind to get decent at racing Sims, I'd get back to writing my crappy alt history sci-fi novel, I'd try to get into board games, I'd try to reconnect with my family and I'd spend more time with my friends, and I'd try to build a house and make it run as much on renewable energy as I could, and have efficient heating.
Then there's all the languages I wanted to learn - French, Italian, German...
So much I could do. I would cook a lot more, I like the food I make, and so do others who've tried it, I just wish I had the energy and time to cook more.