Often, people are willing to build something, they just don't know what to build 🤔
Go on http://g2.com and look at bad reviews of successful products 👎
You'll get validated ideas, with ideal differentiation points.
Of course, there is more to it, but this is a good starting point.
Examples here: https://twitter.com/PierreDeWulf/status/1321902834305163264
If you want to read more about how to validate an idea, this post by Arvid is ideal:
https://thebootstrappedfounder.com/finding-a-market-to-build-a-saas/