Why did traffic from Yandex fall?

Question

Search Engine Optimization

A large Internet resource has been losing visitors from the Yandex search engine since 2013, despite the fact that Google traffic is stable, except for 2013.

What optimization criteria are important for Yandex that Google ignores? In which direction to dig?
Attendance falls only on PC.

Answer 1

links
impure russian
and share mobile check

Answer 2

Because they don’t need sites, they close all their traffic to direct and to their services,
one of the ways to implement the strategy is to rearrange sites in the search results (usually randomly) so that you don’t relax, but carry money for traffic.
You don’t carry money, you don’t get traffic.

Answer 3

Perhaps Yandex users are no longer interested in this topic. Or in general, users are no longer interested in this resource, but the stability of Google is ensured by an increase in traffic from it due to all sorts of Anroids and Google Chromes.