Om Swami
How do I stop blaming myself after a wrong decision?
Don't beat yourself up over a wrong decision
It is very unlikely that you will only make right decisions, since the only way to do that is to never take a decision. When there is a wrong decision, no need to beat yourself up over it.
When there is a wrong decision, there is no need to beat yourself up over it. You would just say, look, I am going to do the next one.