Sorry if I'm stating the obvious, but find a way to make the project not be bigger than just you. Find a way to cut the scope down to something where you can provide value by yourself. Then once you've demonstrated value, you'll have a concrete artifact with which to attract attention and expand the scope with the help of others. Unless you have a very strong track record of achievement on your own, just discussing pie-in-the-sky vision documents is going to go nowhere.

Think about it: if Linus had started with the aim of implementing Linux as it stands today, it would have seemed crazy and probably not gotten traction. Yet it exists, because he first implemented something that was a toy, but was just useful enough to get other people excited.