I think it's somewhat because you're posting interesting and original content, but mostly because you're doing it with great dedication, regularity and frequency, while doing one hell of a job building a brand around an accessible, authentic, open and honest personality, engaging your fans, and being active in the community. I guess you have a knack for it. A presumably unexpected talent you would have never guessed at two years ago.
No, I'm not envious. Why are you asking?
You are right, without the opportunity and encouragement that steemit offered, I would have never known! Very good point!