I fell into the same trap of "build, and they will come" multiple times. Reading The Mom Test changed my perspective on things. I cannot recommend that book enough. Good luck. It's possible. I started my SaaS 8 yrs ago and it more than pays for my lifestyle.
I read the book. It’s more entertainment than useful. I just don’t know how to find the people who have problems. I don’t have specific domain knowledge nor I built a following / circle of people to whom I can sell
