Over time you will find yourself dredging up all kinds of ideas without meaning to (while doing other things) and before you know it you will have a long list that can then be prioritized and explored
My dream would be to start a so-called "micro-startup" selling B2B software for $10+K/month in revenue.
I have the technical skills and, even though I'm rather far removed from the business unit of my company, I have some decent ideas (I think…).
How do I figure out if HR/recruiting would want/need my idea(s)?
[1] I spend my free time archiving Laserdiscs and writing software for improved NTSC post-processing.
My best advice is to try to make the sale, even before you have something ready. You'll learn what parts of your pitch are connecting with them, and which are confusing to them.
But more importantly, you're going to understand if you get the problem as well as you think you do. And you're going to understand if they like your solution to that problem as much as you hope they do.
So, email a few of these potential customers. See if they'll take a call with you. If none do, you're not there yet. But if even one does, you're about to get a ton of information in 30 minutes. Good luck!