Architects who run small business focusing on remodeling, decks and additions are all doing fine around here. My income varies from year to year, but I am never without work. It was easy to part time when the kids were small, and since most of my clients wanted to meet me in the evening or on weekends my dh could look after the kids. You are unlikely to get rich, but it’s a decent living.
I know quite a few unhappy lawyers that wished they had pursued the arts and don’t really have time to do it on the side with any facility.
Back when aol had Artist boards the artists there used to frequently recommend taking business courses. One as I recall was a blacksmith in Williamsburg part of the year and worked for H and R Block during tax season. I am very well connected with the local art scene - most artist have to make money doing something art related, like designing book covers, teaching or doing art therapy.