Decisions like this one don't get made once. They get made again on a Tuesday when you finally book the dentist appointment you've postponed since March, and again when you leave a conversation that has started to cost you something.
The word decision suggests a single moment with a clean before and after. In practice it's a standing instruction you keep reissuing, usually in unglamorous circumstances and usually with nobody watching.
What makes it the best one isn't the feeling that follows. It's that everything downstream — the work you take, the people you keep close, how you speak to yourself at midnight — gets sorted differently once it's in place.