What about tutoring law school students? There are several law schools in the area. Do schools employ tutors — or is this something you could do freelance?
This might not work for your schedule, but check out the listings at FlexProfessionals to see if they have any jobs that could work for you.
https://www.flexprofessionalsllc.com/
You didn’t say, so I’m assuming that looking for a side gig means that you’re not available during standard business hours. If my assumption is incorrect, you might want to mention it — since more opportunities might be available if your time is flexible.