As others have pointed out, trying to find a problem for the solution you have is the wrong approach. It is time-consuming and expensive. Over the last few years, I have been involved in a couple of these experiments, with varying levels of success. But if you have a solution already done, then you have to go through this exercise.

The first approach would be to sit down and write down 10-15 different use cases that can use the technology. Once you narrow it down to 5 or so, start talking a few people in each niche to see what are the issues in them and current players.

Another option is to create dummy websites for different niche markets. You can quickly clone landing pages for each niche. Start sending visitors to it using Google ads, if you don’t have a list. Once you get some leads, talk to each to get an idea of which market is looking for the right solution.
Good luck.