You can do everything right, and fail anyway. This is a core aspect of life.

Which means do not attach your self worth to your job, or your academics, or whether or not you live up to some imposed standard, or at what age you accomplish something or another. Self worth must be inherently internal.

The sooner you accept that sometimes, no matter how good you are or how much effort you poured into something, it can still go wrong or have an unjust ending, the more free your mind becomes.