Lots of ideas seem cool. Far fewer ideas are are easy to sell. And often the ideas that are easy to sell are not the same as the cool ideas.
That's why I think building/marketing ideas "backwards" can be more effective. Certainly less risky. First identify the "starving crowd." Then build a hamburger for them[1].
If you identify a painful problem, people will ask how to pay for it even before you start development. I've witnessed this in person. If you describe the problem better than the prospects themselves, they will just assume you have the solution.
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[1]: "Starving crowd" story by Gary Halbert, one of the most successful marketers: https://www.thegaryhalbertletter.com/newsletters/direct_mark...