394691 Need a seo service

Hello, I need a seo service for my site. My site has dropped its ranking from 2 months. I tried every possible way to bring back its original position. But i failed. So iam trying to hire a seo professional. Here is the info. My site is used to rank well in google. Every query will be in first page. But now the position has changed to last page. Dont know what happened, even when i searched my site's title the serp position is in many pages back instead of first page. Firstly i thought this was due to some google's algorithm change. After this a 10days back my site was back to its original positon and it did'nt last long and dropped again..Now the dropping has stood for 2 months still it did'nt came back. Some of the notes i need to mention are: I did some link exchanges with few of the sites similar to my site content as i thought it was due to lack of strong backlinks. I even did pruchased to 2 textlinks from 2 sites. But still no use. Again i thought google has penalized my site due to link exchanges and i have some footer affiliate links .so i nofollowed those links and removed some of them and put a re-consideration request for google. Now all of search results are coming in 10-15 pages but not in 1st pages. And my the search of my site title in google results appearing in 5th page instead of 1st page. Not a big change but it came somewhat. So i need some help in brining back my original position back. I used to get 60k uniques daily now it has dropped to 10k uniques and even worse sometimes. I need to get rid of this google penality.... PS: Please post only Seo experts and had good knowledge in this field. I can award the project right now. And can pay right now. All i need is a good service.