You have tons more traffic than I do. About the only thing we have in common is that most traffic by far comes from Google. I've always relied heavily on using Blogger (Google's own software) for SEO. I have 15+ blogs and a few of them are 3+ years old. They've consistently delivered traffic based on page-1 results for several good keywords. About 2 weeks ago, my traffic began slowing, so I started digging to find out what was happening.
I use statcounter for tracking and I noticed that my traffic from Google was dropping based on keywords. One by one, this started happening with all my blogs. Within one day, 4 of my blogs lost 60% of their traffic and they haven't recovered since. So, I went to Google's webmaster tools and started tweaking and managing my sites and sitemaps.
I've been trying to conform as much as possible to what Google's reporting there with crawls, etc. It's not working. On Monday, I added 5 pages to one of my better blogs in hopes of getting back on track. Today, my submitted URLs via my sitemap reflect the addition of the 5 pages, but I've actually dropped by 3 the number of pages Google is now indexing. I don't know what's going on... but all of a sudden what I've been doing successfully for the past 3+ years doesn't work at all. A lot of hard and diligent work down the tubes.
In fact, on a couple of my blogs the only traffic I'm getting through Google is "image" traffic. I've ceased getting "keyword" traffic because the pages I had on Google's first results page have slipped back to the 5th, 6th or 7th and beyond results pages. My sites are slowly disappearing. And, at this point, I'm not sure what to do. I'm not doing any black hat stuff, or anything that Google's had a known problem with (webmaster guidelines). My conclusion is that Google newest algorythms no longer like its own blogging platform.
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