Exam accompaniment could be a big source of income, though it can be dull, and of course it comes in big swathes 3 times a year. Particularly for VSTom where an understanding of how the exams work might be less commonplace, though offset by a smaller contingent of entries. If you can get matched up with a few local single-line instrument and/or voice teachers you can pick up a nice big run of exam entries. And cross your fingers you don't end up with the ones where every kid plays the same 3 pieces and 16 of them are taking Grade 1. Also, if you get good at accompaniment, look at work as an official accompanist for events - again, it's hardly going to bring in money every day, but you can start getting established by having everyone come to you for a big event like a music festival. If you are the official accompanist you will play for a whole range of instruments and standards, the variety of stuff you get sent to play is huge.
But you don't get to perform much in the way of solo repertoire, so it depends on whether your love of the instrument extends to ensemble and accompaniment in this way.
Find out if your local university, especially the "new" universities, allow single module students. I parachuted into the middle of a music degree locally and just selected the modules I wanted. You could pick from a first year standard of performance class up to the 4th year standard. I did a keyboard class, 2 solo performance classes at 4th year level, 2 ensemble classes at 3rd and 4th year level and 2 teaching classes at 3rd and 4th year level. It didn't need to lead to a degree or anything, just jump in and do what I wanted and jump out again. Fees are around £300 for a module, and the performance class aspect is really beneficial, you have to perform in front of a critical audience of a high standard of musicianship, who will give feedback on what to improve and how. You also get individual teaching and a weekly family-specific class, e.g. woodwind class on issues of breathing, vocal class on posture, piano class on memorisation.
And finally, how about a small, self-employed type of set-up, based on musicianship and enjoyment, where you would play for a group of pre-school children and parents? If you could make different moods and stories with your piano you could sell lots of those classes. You could sell the benefit of a live instrument. I was absolutely fascinated by my first look inside a piano watching someone play, and all the moving parts and what happened when they pressed pedals. You could even have the kids take turns coming up to play a few notes. The advantage of preschoolers is you can work during the day. Hire a hall, get insurance, register as self-employed, collect fees. My sister does this with a guitar and runs several classes a week now.
Think really broadly about what you can already fit into your life which incorporates a piano and off you go!