How critical is it that J.Webmaster swears at /?baobab_event_id=... and /?yhid=?

Question

Search Engine Optimization

The point is this. There is a site, since December 2020 it has come to seo from scratch. It was filled with exceptionally useful and original content, while ranking very poorly in Yandex. In March-April, I got good positions in Google and now it has collapsed by almost half. From the technical side, everything is in order, there are no errors, nothing has been changed, the content was filled according to the semantic core.

There is such a hat in Webmaster, it is absolutely definitely not pages and why they fall into the search I xs. Hands down already, who knows

Answer 1

So go away, this is Yandex advertising
Baobab, probably also from there, then you are pouring traffic
On the main page, simply write down the canonical

Answer 2

just exclude pages with such parameters in robots.txt (if they are not taken into account by your site of course)
Clean-param

Answer 3

Canonical should definitely help, but for some reason Yandex diligently drowns for using the non-standard Clean-param directive in robots.

Answer 4

This is the result of "By counter" (the function is enabled in Yandex.Webmaster).
Everything starts to be added to the index, because your sites are crookedly configured.
Your sites are sorely lacking rel="canonical"where they need to, disalow: *?where they need to, and Clean-Param:where they should be.

Answer 5

closed in robots
Clean-param: yhid /
Clean-param: baobab_event_id /