When selling a product, a lot of people make the mistake of developing their product first, and then trying to find a market for it. Of course, the process should be reversed.
Find a market first that spends money, then find out what they want and give it to them.
It is certainly easier said than done, but there are a lot of places online where you can do your market research for free. They've done most of the work for you already. You just need to know where to go and what to do to connect all the dots.