Just FYI: You can help promote the #Fediverse by cross-posting.
There's still a sizable userbase on #Reddit and many Kbin/Fediverse users still use Reddit. That's fine. You can help in a small way by posting interesting content on both platforms, then mentioning "This post is also available on the Fediverse here:".
This will at the very least begin discussions about alternate platforms and I highly doubt Reddit can find any rule to fault you for doing so. This is also how Digg started leaking users to Reddit, so it works. Exposure is key. You may make a new user, or get a developer interested in contributing who wasn't aware of the Fediverse before, or didn't think it was significant.