Complicated psyop? It's called "Personas" and a few of my coworkers wrote a few of them just this morning.

You simply promote or finance marketing materials (blog posts, podcasts, youtube videos) with a clear idea of the kind of people you want to reach, and if your "Persona" (that is, ideal customer or evangelist) model is accurate enough, they will talk endlessly about your product for free without having to directly connect with them.