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Nothing.Yeah, taking 4-6 weeks off "SEO" is sometimes revealing, if only to understand major gains may be nothing to do with your efforts, in the same way major losses can be beyond your control
Added three semantically related phrases to content area of a problem page (in anchor text).
But I thought I read that only the first of multiple links on a page counts
"on one of my more successful site launches I took on the discipline of making sure ever page linked externally at least twice. Early rankings and regularly improving rankings were the result."