Lean entrepreneurs can talk about the minimum viable product, but far more important is the maximum do-able project.
Given the resources you have (your assets, your time, your patience), what's the biggest thing it's quite likely you can pull off?
Our culture is organized around the people who get on base, who reliably keep their promises, who deliver. "Quite likely," is a comforting story indeed. [HT to Bernadette.]
Domino's could have offered five-minute pizza delivery, and sometimes, without a doubt, they could have pulled that off. But promising something they could do virtually every time earned them a spot on the speed dial of millions of phones.
Aiming too high is just as fearful a tactic as aiming too low. Before you promise to change the world, it makes sense to do the hard work of changing your neighborhood.
Do what you say, then do it again, even better.
We need your dreams, but we also need your deeds.