I do remember how David Lebovitz wanted to retire as he got older; he said couldn't stand all day in the kitchen- too tiring.
So he reinvented himself as a book author and it worked out well for him.
I love taking classes on Coursera. Classes are taught by real college professors and you will get a certificate on completion to help you get a job ideally. Courses can be free if you apply for financial aid. See https://www.coursera.org/
I always felt sad that I never finished Calculus III and wanted to learn about computer languages etc
I get my certificates for fun as a hobby on the weekends - always learning exploring and developing (hopefully)