How to get a site out of the Yandex filter?

Question

Search Engine Optimization

Good afternoon! I'm asking for advice if anyone has come across a similar problem.
There is a fairly large site - it is already several years old, there are many requests in the top, good attendance, constant registration of new users, etc.
In December last year, traffic from Yandex dipped sharply (from about 700 to 80 uniques per day).
Google has remained unchanged and is slowly growing.
Several appeals to the Platos did not lead to anything. That is, if nothing forbidden was used, then wait and the site will soon be out of the filters.
But 3 months have passed, and things are still there, except that the attendance of Yandex uniques has increased by 30-50 per day.
I want to clarify that:
- New unique articles are added to the site weekly
- No strongs and oversaturation with keywords
- 3rd month optimization of site sections - titles, descriptions, keywords, etc.
- No black hat SEO and cheating.
The only thing is that external links were purchased through the SEO panel, but then they were all removed. I checked external links through Yandex webmaster, there are a certain number of leading ones from garbage sites, it is not clear why they ended up there. Unless the seopult removed all links. But they are no more than 10 percent, or even less.
Does anyone have similar experience? When everything looks good, but the filter does not disappear anywhere.
Thank you very much in advance!

Answer 1

For seopult alone, it is unlikely that you received a filter, most likely a combination of factors influenced.
Continue communication with the support service, try to correspond not on general, but on specific issues. Pay serious attention to the texts, because "there is no glut of keywords" does not mean that the text is of high quality.
Algorithm failures also happen, for example, I had a site that was under the filter for six months - nothing was done except correspondence with the Platons, as a result, the filter was removed.

Answer 2

Instead of the old removed links, add natural ones.
Try to find out under which filter the site is.
Are you sure that competitors didn’t cheat behavioral ones to send you under the filter for six months or a year?