Once you make a final decision, let it go. Don’t reevaluate it every day thinking about what could have been if you had chosen a different option or haven’t made that decision at all.
It just wastes your energy and time. Sunk cost s are sunk with a reason. Focus on the path forward.
Is there something you can change now that will make a difference tomorrow? The previous choice plays no part in this; make the change with the future in mind, not the past.