Hi - I have made several thousands of USD over the years using Adsense on several websites, some of which make a lot, others not so much. I would be very happy to take a look at this and see if there is anything I can recommend to you to improve your earnings.
Before taking the job, I'd like to look at your site and if you are able to, perhaps a couple of screenshots of your earnings, one showing (views/earnings) month by month (for this site only) over the past 12 months and another showing the last month's figures. I'd then work out if I think I could give you any value or not.
If you then chose me, I'd spend up to an hour giving my ideas on what to do to improve it. I could not guarantee results as it's a bit of an unknown quantity.
Feel free to chat if you want...