Site completely disappeared of the face of the earth...

Hello Warriors I want to share think with my site I have site ranked on Google page 2 for competitive and extremely profitable term in evergreen niche site is over a year old and has PR 0, due to adding content and backlinks I broad site to page two position 4-7, also important to mention my site has all 100% unique content, site has been on page two for almost a month and 2 days ago it completely vanish from Google I can't find site nowhere on the serps for any term that it has been ranked I have been used several ranking checker tool to check site ranking all tools showing ranking 0 so to make sure I had to check manually going page by page particular keyword that my site is optimized has 940 results which is 94 pages so I check every single page from start to finish and still I can't find site nowhere ranked on Google but when I type domain it's showing results but I can't find site nowhere when I type keyword I don't know what happen I don't think is some kind penalty if is penalty then 2 things may happen : if is manual penalty then domain would be completely removed but as I said when I type site domain is still showing results if is some penalty for backlinks then site most likely will drop the ranking over page 5 + which is mostly 50 penalty which mean site can't pass page 5 no matter how many backlink you build...but as I said I can't find my site nowhere on Google for any term it has been 2 days already...is anybody experience similar things ? what is the your opinion on this do you thing it may be Google dance or something....also the last service I have been using for backlink's is one service from Warrior Forum they completed campaign about two weeks ago but I haven't notice any crappy article content that they have been using or Spam backlinks all work was done manually...Any opinion on this...