Critical mass happens after enough people are interested. Once you’ve got that, the reaction is self-sustaining.
But any reaction has to start before it can sustain.
And for that, you need what John Paul Lederach calls “critical yeast” (aka Derek Sivers’s “first followers.”)
Find those people. Treasure them. Feed and nurture them.
They might not look like much at first, but your long-term vision won’t look like much till they get going.