While this might be a bit of a sour pill, I would recommend finding people who are actually interested in your idea before starting to build it. That way you can discuss what the users want and need before you even build anything, meaning you don't burn your runway only to later find out you built the wrong thing.
Some good candidates are local companies that use agile — compile a list of local companies that seem relevant and go through their hiring pages, usually it's something that's covered there, if applicable. From there on you can reach out and see if they're interested in cooperating with you. The value in targeting local companies first is that you can meet face-to-face for pretty much free.