Ive tried tons of search engine submissions, have tons of sites linking back, still no traffic or SER
Traffic!! This is the best way to increase earnings. Broaden your horizons, write articles on content not currently on your website, and optimize the page for that one article! Be very narrow -- Instead of writing an article on "Soccer Balls", Write Articles on "Adidas Soccer Balls" , and "Custom Soccer balls". Use a 'keyword finder' to find out what kind of 'soccer balls' (insert with a keyword related to your site) people are searching for, and how many are searching for them. Now write a unqie and informative article on each, and optimize them for ranking well (on-page characteristics). This will only work though if your site is already ranking well in the SERPS =p
another resource for the newbies http://www.easy2promote.com/how-to-maximize-your-google-adsense-ctr.php
Places where you want to put your adsense ads is the one you should try to look for if you want to improve your ads revenue. The best according to my experience is 300 x 225
Many think that the only way to increase EPC is to hunt for high paying keywords. Well, in reality, this is totally inefficient. The soundest ways to work on improving EPC imply targeting the right market, enriching content, improving CTR, tracking, testing. All these done, there's nothing else left than trusting AdSenseâ„¢'s payment system.