What is the reason for the pessimization of the site?

Question

Search engines

The site https://iddeas.rufell under the pessimization of Yandex. The reason is outgoing links from an open banner, which closes the content on mobile devices. The programmer from the hosting manually checked the files for the link source for two weeks, but did not find any problems. I don’t see any banner on the smartphone, even after clearing the cache. Accordingly, the traffic fell from 18 thousand visitors to 350 (?) and continues to decrease. When analyzing the site, many links from third-party (strange) resources to my site are found. What's going on, I can't figure it out?

Answer 1

where did you get the site? it was lowered in September

Answer 2

Check the links to your site, if these are adult or black sites you send to distal tools.