What are the positive (short-term) Yandex algorithms?

Question

Search Engine Optimization

There is a website on the subject of car rental in one region of the Russian Federation, positions in Yandex have always been low, except for seasonality, in November the indicators in the topvisor increased from 11% to 70%, in February they fell back to 11% and are not growing anymore. This was not observed for competitors introduced in the topvisor.
I thought about the "one-armed bandit" but this is most likely not him, because. site for over 10 years. No work has been done on it. A maximum of a couple of articles per month.

Answer 1

I contacted colleagues who are not in the topvisor, some of them also fixed changes on this topic, so some changes in the Yandex test algorithms

Answer 2

But who will tell you, Yandex always hides everything, if the SEO specialist has read the topic, he will never share it, because the topic lays golden eggs