(Suggestions for day 4): what has not been done is giving a fair payout to all steemian users paying what they write, the goal of attracting and retaining readers.

Giving readers the opportunity to interact, remember the little people who sometimes write what they write better but not get paid.
Giving each reader a chance to interact with anyone and make it memorable. Not every reader will use the opportunity, but if it happens and Steemit exceeds their expectations, Steemit will get readers who will bring far more readers than any attempt to get new readers on their own.