Our advice to all sites is:
Find & fix any low quality or duplicate content (using Analytics data to fix the worst pages first)
Find ways to make your site appear more legitimate. Remove ads, affiliate links, do a new design, get some social media interaction going etc
Improve user experience
Work to build a wide range of traffic sources to all pages on your site
Figure out how to make your site more valuable than the rest of the sites in your sector
-- Patrick Altoft