How do I stop owning results at work I can't actually control?

You have carried the weight of whether customers stay or go, as if their choices were yours to command. They never fully were. You can do everything right and still lose them to a budget cut, a merger, a decision made far above your head. Carrying that as if it were all on you is exhausting, and it is time to set part of it down. There is an old, freeing idea worth learning: do your work well, and release the outcome. You are responsible for your effort, your care, your judgment. You are not responsible for forces you do not control. Confusing the two is what has worn you so thin. So draw the line clearly. Ask of each account only: did I do my part well? If yes, let the result be the result. Practice this on one account this week, full effort, then honest release. And if the treadmill itself no longer fits you, that restlessness is information. Beyond it is work where what you control and what you own finally match.