You have identified a ‘customer type’ that you are dealing with.
You have identified a problem that is critical for the that customer type
You have validated this problem with a ‘sizable’ set of customers so you know that it is a ‘real problem’
Your research and customer discussions shows that There is a large enough number of customers that are looking for a solution to this particular problem, and the venture can be financially viable and feasible
There are no apparent existing solutions or good enough solutions that are serving your customer type at this time for the problem
May have started working on a website/facebook/Instagram page to get customer reactions