If you haven't already, I highly recommend reading the Mom Test book [0]. It talks a lot about product market fit, as well as how to get your first customers in order to build the right product.
The Path to First SaaS Customers via The Mom Test:
1. Talk to 10–30 people who might face the problem.
2. Don’t mention your idea—dig into their experiences instead.
3. If the pain is real, pitch only after confirming they care.
4. Look for commitment—not compliments.
5. Build just enough to turn their problem into a usable product and keep iterating.