I spent most of my working life in self employment alongside of "gainful" employment.
It is a lot of work as you often give up on working a 40 hour week for often twice the hours or more. The upside of it is that you get to call all the shots. The downside of it is that everyone you do business with becomes your boss.
I used most of my special interests as a means of employment at some point in time. I tend to agree that I was at my best mentally when I worked for myself,but also reflect on the strains when things went haywire.
My talents were exploited by many along the pathway,but the fires that got out of control were extinguished quickly and I moved along,often wooed with more money and a better position by the competition.I always had my own gig going on to rely on for finances. The side gigs paid the way for some of my interests,and many times became my sole income.
Business is funny at times,being feast or times of famine with often little control over the market you enter. It is also important to understand that you will make mistakes along the way but are only an ongoing process of your education. People that claim they never make mistakes probably aren't doing anything to begin with
Choose a product or service that many want,but always leave yourself with a plan B to rely on when times get tough. I strongly recommend you keep some employment field open even after you go all in as it were.