I understand your answers, but there is still something strange.
In the updated sites there are no popunders or other advertisers, and hardly my users make more than one or two visits (even in the old sites).
The texts are automatically changed by replacing some words with their synonyms. (as far as possible)
All this certainly causes many problems that will never allow my sites to make billions of visits daily, but less than ten is not possible... there must be something else, but I do not understand what.
In my career I made one-page sites with a couple of lines of text and made more visits to these new sites. With this topic and these amounts of content, it is not possible.
But I have an even weirder example, I opened this site about a month ago.
Adult Sex Search
This about a year ago.
It started to grow a bit towards mid-October when I added a few tens of thousands of new keywords. Note that I had to add them, normally are collected from the visits of users, but no visits, no keywords.
Hard Tags
The model is different, it collects searches and sends visits to my sites, but it's always old and new generation of my sites.
The first one sends visits to the old sites, the second to the updated sites.
How is it possible that there is such a big difference?
P.S. for new sites I created everything new, even Google accounts for webmasters and analytics, new mails, new accounts etc etc. etc., but they are on the same server.