(1) is the closest to the right path, though it's not phrased as one. And in fact you never do know when you'll hit the tipping point. So you have to work fast.

But your existing users are the place to start. There must be something they like about whatever you have, or you wouldn't be there. So you just have to learn to understand them well enough to turn that like into love. In the process you may appeal to a broader set of users, and as you iterate the "typical" user you focus on can move.