Don’t overthink this. Your intended audience are the people you are building for.
These are the people that will find value for the solution you’ve built. They struggle with the same problems that you have, and they are more likely to say “yes” to you.
You can segment based on industry, role or title, demographics, interests or hobbies. It really doesn’t matter as long as you are able to target down to the right people that will find value in what you’ve built.
As a word of caution, it is easy to think big and target everybody in a given industry; don’t do this. Trying to please everybody is the key to pleasing nobody, and the more tightly defined your initial target, the better.