Ranking high on Udemy - SEO

Hi

Does anyone have any idea how one ranks high on Udemy ?

I mean are there definite paramters that are openly stated?

I have two courses. One had practically vanished from the search (to be honest almost no payed students signed up and almost no one had gone through the course).

For the other course I currently appear as number 1. I'm usually between 4th and 7th place when I search my topic.

I don't have many students and only 53 reviews which far less than the other instructors and my course rating is 4.5 which is okay - it was higher for awhile. So I'm kinding of wondering what I'm doing right.

Obviously I should be happy the course is doing well. I'd like to replicate this in future courses.

Thanks !