"Most of the time, this leads to the well-known case of solutions looking for problems - beautiful technology that can’t become a profitable business."

OP dances around the solution, but never gets there:

Find a customer.

They're everywhere. And they need everything (or so it seems sometimes). And they're not bashful.

Once you have a half dozen customers in any industry, identify something they would all love. Pretty good bet building a business around that, not what you love.