I'm not really going for the prize, but since you're looking for recruiting ideas, I should mention... here's another idea that I had a while ago.
https://steemit.com/blog/@remlaps/tag-proposal-for-steemit-recruiting
Basically, a hashtag like "introduceyourself" - "recruiting-help" or something like that - that whales could monitor to create sign-up incentives so people could encourage their own friends to join in a targeted way.
Thank you I will have a look:)