I have a website that used to be on the second page and sometimes the first page of google for keywords like *youtube to mp3* *youtube to mp3 converter* etc but now I have completely disappeared from SERPs for those particular keywords which are my main keywords and this happened in like a day or two which is very strange since I haven't gotten any msgs from webmaster tools regarding anything for a long time .
I have tried reindexing my site again but no changes . I have no idea what to do since I am very new at this .
I would appreciate any suggestions .
Thank you !