I cannot for the life of me figure out AAA games

I’m really struggling to make a good AAA game. Every game I have made is an adventure game so I have the sliders down. I have 2 world design specialists (both of them are also design specialists), a graphics specialist and a dialogues and story/quests specialist. However I always make mediocre AAA games. I made a AAA MMO which is selling quite well but got half baked reviews. I think the issue is that my employees are over worked. My story/quests specialist is at 130% just doing the story. Same for my dialogues and world design specialists. What can I do about this? I really want to make a good AAA game.