I got into building my SaaS just recently, I saw it as a way to spend the time I already spend on my laptop usefully, and making something on the side also didn't seem so bad. My idea was to build a tool that recovers failed subscription payments via email - a churn buster of some kind. I got into doing it, but halfway through, as it's my first time, I started getting some doubts as to whether it's gonna be of any use to anybody. My question is - how do you know if people can get some use ou...