Common advice is to find where two of your interests or talents cross. Programming is one here, so now just build something that's useful in another of your hob

Common advice is to find where two of your interests or talents cross. Programming is one here, so now just build something that's useful in another of your hobbies or interests. Another idea is just cloning an existing idea. I think there are probably many niches where it would be relatively easy to build the best product, and other niches where the number of customers is so large that it's not too difficult to capture a small part of the market, even if it's saturated. 12k/yr is a tiny amount of revenue.