Steem basically needs to fulfill the needs of three main target groups:
Investors - need: generate (preferably passive) income
Creators - need: share and monetize content
Networkers - need: connect with likeminded people
It's interesting that you didn't include "voters" or "curators" in the list of stakeholders. All voting on content should be done by bots with SP delegations so investors can get their (preferably passive) income?
I would suggest that a healthy social media platform also needs voters, and even just lurkers. Not everyone wants to produce content of any sort. And creating content is worthless if no one views it. In a healthy content ecosystem, on average, we'd probably need... I don't know... 100? 1000? Viewers per creator. Bringing them here should probably be a top priority, not an afterthought.
If we want to attract authors, there has to be an audience. If we attract the audience, the creators will follow.
Networkers do include curators for me. If you network, you automatically engage with people and content. That's at least how the algo is currently designed on Steem. Networkers engage through votes, comments and resteems, so they act as curators if you prefer to call them like this.