Focus first on you and then on the external situation. Work inside out.
Look for rigid and extreme attitudes, e.g., You must do what I think is right. It is awful if you disagree with me and do it your way.
Challenge your rigid and extreme attitudes and turn them into flexible and non-extreme attitudes.
Then, address the external circumstance or the other party.
Change what is changeable. Accept what is unchangeable.
Keep at it. You may be well-practiced at defeating your ends with rigid and extreme attitudes. You can improve how you handle adversity, but it takes daily effort.