The Parable of the Two Arrows: "In life, we cannot always control the first arrow. However, the second arrow is our reaction to the first. The second arrow is optional."
Victor Frankl, the Austrian philosopher and Holocaust survivor renowned for his contributions to existential psychology, has a brilliant framing for this: "Between stimulus and response, there is a space. In that space is our power to choose our response."
To create the space and move forward after a negative event: Pause, Reset, and Choose.