A contest to in-steemit people, with your influence isn't big deal i think. But to bring people out of steem-steemit, that's another story. Maybe some kind of giveaway with some conditions for the participants will do the job. If the contest is visible to other social networks, and gives the opportunity to the outsiders to participate or something like that.
I don't know if this help you, but i hope to inspire you a bit.