Here's how you do the research, summarized from Amy Hoy's sales safari of 30x500 fame

You find a community of people you can talk to. Often these are people you're already a member of.

Then you talk to this community. You observe, you engage.

As you observe and engage, you listen to their problems, their pain. You take notes.

Solving any one instance of that pain is a potential business.

Good luck.