I agree with Buck. My side hustle is picking up flying. If I pick up one extra day of flying a month that is roughly $20K/yr. I happen to love coming to work and doing this job. I don't have or want to do something else that can bring me an extra 20K/yr. The biggest risk though is I need to retain my health to keep doing it.

It helps that I live in base and can easily pickup one days.

Oh, I've also written some
magazine articles and those are good for $100-$150 a pop at my typical length. Pays for my subscriptions.

I do enjoy seeing what others do though, very much.