I manage several campaigns on ShareASale's network. I realize that the success of any campaign may rely heavily on the COMMISSION structure and EPC, along with the product or service.
Offer incentives for affiliates for their marketing efforts - bonuses for 1st sale or minimum number of sales, etc. Romance your publishers until you find your best partners.
Attract publishers with your high EPC rankings - you want to raise your EPC so that your campaign rises to the top of a particular category (think of Google
SEO ranking) - trustworthy PPC partner(s) may help with your EPC. Be willing to pay more for their marketing efforts.
You may also consider Featured Category listings to increase your publisher base, set your campaign to auto-deposit, make sure your sign-up page is EXCITING and 'converts' a publisher!
Also, make sure that your "Organization" name is descriptive of your product or service. For example: Desko Men's Urban Clothiers vs. Desko (the second doesn't describe the product offering).
There is more to do, of course, to build a robust campaign. But I hope this helped, even if just a little! Thanks, Linda, for making this forum available.