You gather a group of like-minded authors and artificially boost the ratings and reviews. Many reviews are made on a mutual exchange basis. I read your story and give you a favourite, you read my story and give me a favourite.
But to be honest, I have never properly understood RR. Too confusing for me, and the UI is terrible. I wonder how they got so big, certainly not because of user friendliness.
But trending on RR is harder as it is much more hierarchical. It is like scribble at the beginning where only top stories where featured in trending in a perpetual cycle. Hardly any newcomers.
Give every story you meet a 0.5 on the way.
And write LitRPG. RR loves those stories.