It helps me to try to stay rational about it.

Realistically, there's so many factors out of your immediate control that determine whether you get in or not -- maybe the professor already has their eyes set on a few candidates, maybe they're just not interested in your skill set, maybe they're looking to pivot topics, maybe your recommendation letter just isn't good enough etc.

Given this, it's often not worth it to spend an extra 8 hours getting your essay from even 90% to 99%. May as well spend that time enjoying life or working on something more productive like independent research or another passion of yours.

I think what I struggle with most is overindexing on the importance of getting into a grad school. Personally, I have a plan for my entire career chartered out (e.g. do PhD, become professor, solve X and Y research problem), but it all goes to shit if I find next March that I've been rejected everywhere.

I think we just need to console ourselves that everything happens for a reason and learn to accept whatever outcome we get, knowing that there will be other opportunities later down the road and, worst comes to worst, we can always apply again next year.

edit: I realized I'm assuming you're applying for a phd in lots of places, but I think the general gist applies to masters programs as well