Hm, only one thing?
Replace the entire Management.
Preferably with a creative, innovative one. One that contains Game Designers. A team that is capable of and embraces communication .
Not grind or mechanics designers that only know 1980's/1990's unlock-gating or grind - nor pure spreadsheet designers with zero in-game experience.
I'm talking actual Game Designers with MMO and MMO Balancing experience. People who know the difference between "yep, this mechanically works" and "yep, this should be fun and surprising".
And a team with love and attention to Detail, with alot of common sense and an understanding how important QA is in modern products and why that is so.
Yeah, I guess that'd potentially solve 95% of all problems and unlock the true potential of this Game.