Rankbrain is totally on Artificial Intelligence before a days google doesn't take the weightage for the Rankbrain. Now you work on your website so you can follow the Rankbrain techniques.
RankBrain is part of Google’s overall search “algorithm,” a computer program that’s used to sort through the billions of pages it knows about and find the ones deemed most relevant for particular queries.
RankBrain is part of the overall Hummingbird algorithm.