Maybe we have written on this before, but its worth restating

Generally Speaking, 80% of your outputs, will result from 20% of your inputs.

This is abroad statement, but worth thinking about if you are a player or a coach

What are the 20% of things that are you causing 80% of your success? Identify these and improve them

What are the 20% of things that are causing 80% of your failures? Identify these and Eliminate them