Go looking for them wherever you think they might gather or hang out (online or in person). Reach out to those who seem like a good fit and ask them about the problem(s) they’re having that your product solves. Once you know if your product would actually solve it well for them, tell them about it in earnest.

If you’re doing that honestly, where they really have that problem and you actually have a good solution, you’d be a jerk not to lightly pitch it at that point.

You could probably do that up to 100 or so customers reasonably easily.