If Google and Yandex analytics systems are connected to your site, they know user behavior very well. They also know how users interact with competitor sites. If your site doesn't have good metrics, it is considered worse. Bounce is when a user was searching for, say, an air conditioner, landed on your page, then returned to search and visited another portal. This is bad. When this happens constantly, your site drops in rankings. You need to find a contractor that provides both development and promotion services.