They start to doubt their abilities. They start to make dramatic changes in a panic. You have cultivated certain skills and abilities that work for you. Just because they did not work today or this week does not mean you should make wholesale changes. You should not give up on what brought you to the dance.
People have a tendency to change course too often in life.
Set a solid course and trust in your skills and abilities. In my twenties I competed in racquetball professionally all over the United States. When I was having problems with my passing shots, I didn't give up. I would practice for hours hitting thousands of passing shots to every corner of the court. A few weeks later I would be competing in a match and the shot I had been practicing could win a point.