I thought it was obvious but whatever. The RS aspect of the community is saturated and using social media to try to expand won't work as long as it focuses on RS. Few people will want to make it obvious that their accounts are involved in RWT since it's likely they'll get banned for it as a result somewhere down the line.
So your options are either to expand with new markets or ride out the RS hype with minimal input until the site is no longer profitable. Buyacc's example of rocket league works out nicely if applied in the right way. CDT should be holding events such as tournaments for the markets you wish to expand to, and PR should be sourcing out noteworthy people to take part and in turn promote it.
Rocket league tournament with a $500 prize pot? Get a few streamers involved from the community and it'll almost market itself, and only run it with X participants, raising the pot until its large enough to bring people in. This kind of model could be applied to any game, and you'd want people with experience in community management who do this regularly to run it.
It just seems like you're putting too much work in the RS side when that should be driving the expansion of other areas. No business sits on one market forever.