I would do loads of degrees. History, English, Psychology, Politics, Spanish, etc. Having the brain space to focus on learning would be amazing. I did my masters part time while working full time and it was a nightmare. Glad I did it but I couldn’t do my best as I was bogged down in work stuff.
I would also like to learn more languages. I do a bit of Spanish and Danish when I can but I rarely have the mental energy after work.
Travel too. Maybe write a book.
Sting has a lot to answer for