What would you suggest?

To hire someone, to tell you the exact answers.

Seriously, people, 100% seriously.
Marketcap of Steem is 100.000.000 $.
It's a serious money. It would be perfectly reasonable to pay some real experts 100.000 $ per month to fix the problem.

Invest 1% of the value to create 100% of value (for those not good at math, to make Steem about 1 $ worth again)

If you still want several free advice from me (*absolute amateur):

• Make RT publish the collaboration PUBLICLY
• Put Steem on Crypto ATMs
• Bring some people from YT and Patreon