Find what RD100 is good at and recommend it when the need arises
Figure out the target audience and current perception of the game, for example, being a BRP derivative people will probably perceive the game as deadly/crunchy.
An introductory/quickstart product like Savage World's Test Drive rules; the book while amazing is a huge beast, with many subsystems. A barebones product let's newcomers (specially non-BRP gamers) test the game without having to sit down and read the whole thing. FFG's beginner box introduces the Star Wars system in very manageable chunks.
Conversion documents for popular media: Star Wars, Marvel, Westworld, GoT, Walking Dead. A couple of years ago someone explained the Avenger's battle in New York using Fate Accelerated, that drew many people into the game and helped grok how the game was supposed to be played.
Make podcasts, write to kurt wiegel or other reviewers with a fanbase to put the game on their radar, post actual play's on youtube.
Keep the content moving, make a fanzine
Build a community on G+ (Sadly, while I love forums, communities are easier to access with cellphones and tablets) with links to the content I've talked about above, direct curious folk to said community.
Make products using the OGL
Ok, that's a long list