Ask HN: How did you get a your SaaS Idea?

As a person who always have been in tech it's really hard to think of anything that's not tech. Another npm package, shall we? Just wondering. For me my best ideas, none became success yet, but they were clearly solving a bigger and lucrative problem, have come unintentionally when I'm doing something else. Isn't there a way systematic way to go and search for problems. Like go to businesses, analyze them for a month? Are businesses open to that?