Been there before and it's not an easy task. We got lost in a lot of wishful thinking and misinterpreting our customer interview.
"Looks interesting" is often a polite way to say "cool, but we don't need it". Imho, the first thing you really need to figure out is, if you are onto an actual problem that people have and are willing to pay for. I have built 2 MVPs before that nobody used in the end because we didn't do our homework in the pre-MVP explorative part of the journey.
Talking to more people should be your number one priority at the moment. I wouldn't even pitch the solution in the beginning but start asking about their work, their roles, their problems etc. If there is a clear fit you may pitch/teaser your solution at the end.
Contrary to @salimstartup, I would say marketing is definitely something you should do, but you shouldn't pay for it. Content marketing is really the way to go at the moment. Find out where your customers hang out (hackernews, reddit, medium, linkedin, twitter, ...) and post valuable content. Takes a lot of time but makes getting interviews with other people much easier and eventually should lead to (some) inbound leads/users as well.