Just training yourself to not be overly happy for ups and not be too sad with downs. Just part of the journey

Like every other skill. Practice
How do I stop missing my 3 pt shots during the big game? I get cold and keep missing most of my shots
How I stop failing my new skateboard trick I'm trying to learn?
Do something enough times until you're an expert and then you don't have to worry about mistakes as much

That is just how it is, don't focus too much on it, better days will come.