I have a niche site that was ranking #3 for its main keyword and been up for almost 3 years now. The site had been in top 3 for almost a year now and I did not touch it at all. Then last month all of sudden one day the site is no longer ranking in top 3 and now around #50 position. Then a few weeks later it has slipped all the way to page 14 and 15. This site has all unique content and links from various sources. It had solid rankings for such a long time and then to see it drop so far back is puzzling to me. I can understand a few spots here and there but like 14 or 15 pages back is weird. Since I have not touched the site for so long it was not any bad links that might have triggered this. The top 10 sites are the same ones and nothing new has moved into those positions with same retail stores offering such product. So can someone tell me what causes these drastic drop in SERPS for sites that have been ranking for a while. Not to mention I had several other sites do the same...some dropped from their #1 spot to middle of page 1 or top of page 2 and orhers further back on page 5-10. It is just weird phenomenon that all my sites getting hit at same time. Just don't know how to go about getting them back in rankings...whether to focus on adding more content to site or start a massive backlinking campaign or both. Any suggestions?