What to do if a site that is in the top falls in the search engine due to the fact that its exact duplicates appear?

Question

Search Engine Optimization

Hello, when the site reached good enough heights, copies of it began to appear. And immediately there was a hard downgrade from Google, in addition, the primary source of information in webmasters for several articles indicated not us, but duplicates. Who will advise what?

Answer 1

Write to the TP Google Search Console.
Another option, if you have rights to your content, contact the hosting where duplicate sites hang, it happens that they ask the owners to remove the site even without a court decision, but simply upon request. (P.S. can work even if you don't own the rights to the content).
There is nothing more you can do.

Answer 2

Ping search engines first in the webmaster when writing an article, they avoided indicating the source