all you can do is to encourage others to run the masternode of a certain coin by introducing to that coin and telling them about the benefits of that coin! good luck with that
What are some ideas on getting more info out on the masternodes?
the "info" is already out there on a lot of websites and people can read them by simply searching. you could gather all of them or the good ones in one place or add your own explanations if you feel like some parts of it need expanding.
but in the end the coin with the masternode (the project itself) has to be interesting to get people interested as i said before.