Was there a boost in organic queries?

Question

Search Engine Optimization

One person worked with the site (sort of like a SEO specialist), everything was normal and without pretensions. As soon as he left, the traffic dropped critically, that's right in 1-2 days. On average, there were 700-800 cuts, now they ate 100 a day. Mostly organic traffic dipped.
Are there ways to check? What are the options?

Answer 1

Judging by all the input data from the description of the question, as well as from the comments (the time spent by users on the site increased significantly after the traffic fell, traffic disappeared from branded queries, etc.), it becomes obvious that there was a cheating of behavioral factors using services like movebo, serpclick,user.
These cheats can most likely lead to a PF filter from Yandex, which will drive the site beyond page 5 for 6-12 months.
Also, judging by the large number of dropped links, your optimizer used leased links, which can also lead to filtering by search engines.

Answer 2

Yes. This is a 100% cheat.
If the following conditions are met, there was no cheating (site with Russian content):
1. The number of unique IPs from the countries of the former CIS / the number of unique IPs from all countries: >0.75
2. The number of unique visitors by ID / the number of unique visitors by IP = 0.9...1.0 (+/- 10%)
3. Number of views over 1 page per visit / number of views of ONE page per visit: 0.3...0.5
All parameters - for the same time interval. (a month or two ..)
If one of these points is violated, there was a cheat.

Answer 3

If you are sure that the users were organic and alive and give out clear and sank in the issuance of the position, then he probably removed all links to your site or changed something on the site

Answer 4

looks like a seo

99% of seo specialists are actually "kind of like a SEO"
Check what?
At best, it increased traffic, at worst, a bunch of links fell off and the site began to fall in the search. Given that this is a matter of several days - rather the first.
Another option is to stop advertising companies.

Answer 5

Maybe he banned site indexing in robots.txt before leaving?

Answer 6

without a chart from the Search Console, it's all frivolous
, or at least ecommerce

Answer 7

Hello. There is a shift. After a sharp fall, a sharp rise.