If you are making money using adsense and other programs like adbrite or bidvertiser, traffic is the main factor to generate income for you. So you need to improve your search engine rankings. How do you do these?
1. Use PPC programs. You can try Adwords for that matter. You can even advertise using facebook. If you don't want to spend money, then proceed to the other step below.
3. Bookmark your articles. Bookmarking is an old method of generating backlinks and traffic. The effects will be most felt in the long run.So go ahead and register to at least 5 bookmarking sites starting today. Bookmark a few articles of yours and in no time you see an improvement in your SERP ranking and in traffic.
4. Use Youtube to promote your site. Upload a video on youtube. Place your link in the description box and voila, expect a few more traffic plus extra backlink to your site.
5. Use Yahoo answers. Answer questions that you are familiar of. Then leave your link. Be careful not to spam or else your account will be deleted.
So that's it for now. I hope you learn from these. Especial thanks to Red is Hot!