How does the different ranking works?

I can’t seem to find the difference between the different rankings. I increased to rank 4 very recently. any idea how can I increase my ranking? previously I will follow the guidelines and set up my store 100%, but now that I’m 100%, I don’t see anymore guidelines.

After that, there are no more guidelines… it is dependent on an algorithm that looks at views, sales, maybe conversions.. and who knows what else. None of us know exactly how it works.