Your current promotion as well as your past promotions are basically the best if I have to say. I can say it is the best because your promotion is not focusing on wagering only while most other casino's promotions are just about wagering competition.
My suggestion, probably you can start a smaller competition to boost the traffic of your site. Small competition where players are playing with the minimum bet to hunt for something by playing the game. It is indeed very common promotion but I see it as a great way to get a lot of participants.
your last suggestion was familiar to me and i think i have seen this on some gambling site that i have visited it was like roll hunts right ? some gambling site have forums and this is where they conduct the game while some that dont have a forum are only conducting the game on the chatbox . idk if this site have chatbox or forum because i havent try them yet but if yes then they can try to add roll hunting games too . that is also one way to attract players to play and another source of earning for the site too
Thanks. Sounds very interesting. I will investigate a bit more...