I wouldn't build a solution for the first interested prospect. Since he has an MVP but product market fit is unknown I would try to set up say 25 appointments u

I wouldn't build a solution for the first interested prospect. Since he has an MVP but product market fit is unknown I would try to set up say 25 appointments using a consultative sales approach. If you can do that many 20min calls, face to face appointments or whatever and put yourself in the mindset of genuinely evaluating whether your product helps the prospect or not, at the end you'll know if this MVP is the right thing to sell or needs to be changed. You need a lot of calls like maybe even more than 25 if the market is segmented, cause you might be right for one segment but not others.