Trafic drop after a huge indexation
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Hello everyone,
My website used to have about 500k indexed pages in Google.
After publishing fresh sitemaps and a little local "buzz", it now has about 6 millions indexed pages and the numbers are skyrocketing (GWT says 7 millions and it will probably keep going).
My website has a total number of pages of 10 millions.
I used to have about 5k organic visite each day, but since the big indexation has started, I now have half less. I read many things about that kind of trafic drop, and it seems to be a normal step when indexing a huge site.
I just wanted to know if you guys had any similar experiences and if yes, if there are specific tasks to do in order to recover/develop the organic trafic or if it's just a matter of time.
Thanks for your help and share of experiences

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Google hates duplicate near duplicate content so the first thing I would question is whether your new content falls into the category, if so will devalue your site - hence the traffic drop!
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If you have a big website like millions of pages and as you said you have, drop in traffic after the big indexation make sense to me but your job is not only to sit down and wait for the traffic to come back.
My idea is to accelerate your SEO and promotional activities and on the technical side get some quality links back to the website (home page as well as internal pages). This will give Google a hint that the website is worthy and people are continuously linking back to the website and will rank it accordingly.
Hope this helps!
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Lots of people come here and say.... "I added millions of pages to my site and my traffic dropped."
The answer is usually.... the millions of pages were thin content, duplicate content, cookie cutter content or rubbish content and now google sees the site as low quality.