I have a site wich gets over 500k visitors/month, which I curently monetize with adsense, but I have a very low CTR, under 0.5%. A few weeks ago I used a floating ad banner, and ads were disabled for that site, for a few days. After the ads were reinstated, my CTR dropped. Before that I got an average of 3-4% and after ads were disabled it rarely goes over 0.5%.
Do you know what could I do to get my CTR back to the levels it was before, or what other monetization methods should I try?