Being meticulously on top of everything and prepared for anything is exhausting and doesn't prevent nearly as many problems as it should. There's always something: an edge case, that one person, that day when the moons align. The exception that ruins a perfectly prepared plan. The one move that negatively affects your average score.
You can resolve to be even more prepared: to update the system to cope with that additional edge case, that type of person, that moon configuration - and it will work. Until the next unpredictable disruption.
Or you can change the definition of success, decide that the exceptional failures are all part of the plan. Decide that success is things falling into place perfectly as they are. As long as you aren't picky about what place means. Or perfectly.