I don't know what to do ! Been approached by a type of customer I didn't thought of !

Hello,​I'm working on a project for a few months now. I've do the market research, some user forms, I've make severals prototype to find what users wanted, I've developed an MVP that is currently being beta-beta-tested by a very few users (to find the more blocking bugs for users).I planed to upgrade a bit the MVP (so the user experience isn't a pain) before releasing it in a wider beta-test (like 25/30 beta-testers).Just so you know : my target niche is a small niche, that's why I'm not talking about 400 beta-testers.​My problem now, or the thing that is blocking me, is that I've been approached by a potential customer, but not the one I thought about.My solution is aimed to be B2C, and I've been approached by an entity that would push my solution to be B2B2C.[I'm building a SaaS platform to help farmers manage their investments]​What should I do ? Or, what would you do ?Focus on the beta-test with real users, that will be real customersFocus on the B2B2C customer​For now, I've just been approach by someone that told me "They working on this kind of problem, they really need a solution like the one you're building, they're ready to pay, I can organise a call with the CEO".​This is my first experience building a startup, and this is my first experience with a potential costumer (I'm a tech dude).​Thanks for the help see hubwealthy.com/wealthy