This is probably the most informative and helpful post I've read so far, might not mean much as I've only been a Steemit member for a few days but I am pretty critical! I think Steemit is definitely a different social media platform to others and therefore you can't expect to become successful in exactly the same ways.
I think the biggest difference is interacting with the Steemit community, it's still a relatively small community so it's more intimate and therefore interactions with others go a long way. Facebook and instagram I feel like you can buy support...
Anyway long winded post to say I liked your write up, was really useful and I'm sure has helped a lot of people! Thanks!!