Learn how to do taxes for other people. VITA offers a free 5 day course every year. https://www.taxpayeradvocate.irs.gov/get-help/filing-returns...

You'll start out with simple returns at your skill level during tax season. After a few years you will be pretty good at individual income taxes.

Needless to say, this is a valuable skill that will help you for the rest of your life.