I just realized one of my sites dropping from 2nd to no 8th now for a keyword in very low competition niche. I think almost no one does link building. After Google algo update around 18th December, that ranking drop happened. I just finished doing an analysis of my backlinks (I downloaded all the submission URL from GSA, check whether they were indexed, looked at exact anchor percentage, and also looked at follow/no follow link). Some things that I notice are
1. My do follow links are only 8% (39 out of 478)
2. My exact anchor text (eg. blue diamond) is only 8%. However, since my domain is EMD (www.bestbluediamond.com), total percentage of anchor text that has words "blue diamond" (including "best blue diamond", blue diamond, and www.bestbluediamond.com, etc) is 34%
3. The percentage of links coming from deindexed domains is only 6%.
My guesstimate is, reason no. 1 and no 2 are the culprit for my ranking drop. Do you guys think the same thing?
Thanks in advance for your input!!!