Serena has always been known to have a strong a feisty attitude but having an outburst in the US open semi final is not really cool girl! You are a great player but you cannot win all the time. Give others the chance to shine.
There are times in life that you will lose and the best way to deal with it is accept it gracefully. Just forget about it and move on…if you still can’t take it off your mind, try doing something that you love like maybe doing some exercise on your ellipticals or go shopping, buy yourself a new tennis racket or something.