I saw the title of this thread and thought that there might be some really interesting insights into writing style. I was dissappointed to see it fell immediately back onto the metrics topic

How to measure success by counting likes and faves and views is a topic that has been beaten to death !
On the surface, what really makes a successful story are original plots, credible characters, perhaps erotic scenes (depending on your taste). But certain writers have a magic sauce that really turns the heat up; it is those pieces of writing (think of SpankingTheatre's "Grimoire") that are really successful, regardless of how many eyeballs they attract. If we could decode the recipe he used and do something similar, then THAT would be a successful story. What made it successful ? It was erotic yet tasetful, it was non-trivial yet easy to follow, ... and so on.
The biggest compliment I have had on a story was: "Gail, I don't know how you did it - I wish I dod for my own writing. Your story is quite simple, but by the second or third paragraph I was drawn into it.....I will study this for my own purposes to see if I can work out how you did it."
So for that story, I was successful, if even for only one reader. The metrics don't count.