The instinct might be right. I've watched people set the line between what they make for themselves and what goes to market, some keep it clean, some let it blur. The piece works either way, but the question you're asking while making it is the real pressure point.

I ran my photography as a side thing for years before I let myself think about actual income from it, and honestly, the shift didn't wreck my style the way I feared it would. What changed was I got clearer about what I was making and for whom. Etsy's a solid start. You'll learn fast what connects and what doesn't, and that feedback loop helped me more than any amount of theorizing ever did.