I have my favorite patterns.
I fish them first and they therefore get better chance than the others.
I think it's also a question of believing in the fly you are fishing.

I tried Pheasant Tail many times before it came one of my favorite patterns, I never catched anything on it. But one day it happened, I don't know why, but I started fishing on it.

So it's a question of keep trying the pattern and mabe convincing yourself it's a good pattern, be positive, this fly is good