Know what you can and cannot control
You can’t control everything:
B players refuse to acknowledge this and keep demanding stubbornly, “I want this! I want this! I want this!”
On the other hand, A players accept that there are some things they can’t control. Instead of trying to fight reality, they focus on understanding the levers they do have, what effect each has, and how they interact, and how to use these levers to get what they want.