Ask HN: How can I find a SaaS project to build?

I'm a software developer and I want to make a SaaS product. I've reached out on reddit asking for someone to partner with who has:

* A SaaS idea that is solving a proven pain point for SMBs/SMEs

* At least one customer who is ready to pay for it

* The capability of selling the software and is in a position to get customers for it

I've posted a couple times and haven't been able to find anything. Am I asking for too much?

It seems very difficult to find software to build that is actually solving a problem for people. There's a million me-too-social-media-platforms, projects that are re-inventing existing software that is serving its domain just fine, or ideas that simply have no real plan for gaining users (other than spending hundreds of thousands on advertising to take users from other platforms) or have no real way to demonstrate or gauge the potential demand.

The issue seems to be, at least partially, that the niche problems I'm looking for require expertise in some industry that barely anyone in the general public has given any thought to - for example, I've read about someone who had success in building software for doggy daycares. I'd have no idea this is a problem needing solving unless I operated or owned a doggy daycare.

How can I find a project to work on that has reasonable evidence to show its need/demand?