Increasing your adsense income really depends on how much traffic it comes to your website at the same time keywords play a major role in your adsense income as well
dude you can actually do it yourself... just google it and you can find some tips and tricks about it..
There is no an exact formula, but I would recommend that just writing content that will interest people to read or learn. With this it will attrack people to refer your blog or website, therefore traffic will increase.
Here is a cutting from some advice given by Google themselves on 25th March 2011. 'Some publishers believe that by writing about high paying keywords they will be able to improve the earnings on their site. This is not a practice that we encourage. In fact, we always recommend to write about subjects that you know well and that you are passionate about so you can continue to create the compelling, original content that attracts visitors to your site.' Source
Increase presence of your blog on the search engines which helps to generated traffic & visitors for your blog. & it will automatically increase your adsence revenue
Well as said by many of us here, make sure you have appropriate keywords and get more and more traffic everyday for your site. You dont have to reply on someone else for getting revenue for your adsense, you can obviously do t by yourself. Remember never fall for fake and automated traffic to just increase your revenue, you might get penalized and end up in getting banned from the adsense account. You can increase your traffic in various ways like social bookmarking, article submission, networking with your friends online as well as offline