the futility of publicity

Suggest you research the history of this field (cryonet.org is searchable). For more than 40 years, cryonics has received copious press coverage, to the point where I would guess at least one-quarter of the adult US population has a rough idea of what it means. And, of course, anyone can find the organizations online. If publicity was going to work, surely it would have worked years ago.

I see two ways to increase membership: Personal interaction with potential clients, and improving the procedures to the point where they encourage greater confidence. I don't see any shortcuts.