We have put the Multiplier contest on hold for now so we could have some more improvements as we did not see any significant number of participants over the rounds that we did.
We are working on the improvements and once done, we will look at starting it again with better rules and attractive prizes
First of all, you have to increase the prizepool for the contest. You have to make it attractive to the community members. The min bet limit is reasonable here. Then increase the period of the contest from 1 week to 10 days. It may not have much impact though. Finally, you have to tag some users of the forum who usually participate in the multiplier contest and show activity in the gambling section of this forum. At least tag those users to make them aware who is a member of your Jacksclub signature campaign.