As others have said, you don't know.

But start with you: Are you building it because you want to build it, or because you want it? Are you in love with it as a project, or as a product? Is it something you want to use?

Then, when you have it as a just-barely-usable thing, give it to a few people who have the same need. Get their feedback. Does it actually help them? If so, then you may have something.

I want to build it because I want it. In love with a building my own company, and I’ll actually use it. It’s something I want to work on, trying to get more and more users because it’s community driven.