Discipline and Faith. Believing in what you are doing is a must, overtime your skill will reach a level of mastery when you have the discipline to improve it. Have disciplined attitude and approach the task with joy and you will have a good outcome.
If you are not satisfied, consider it a learning experience and discipline yourself to work hard. The battle is over when laziness shows up. Faith and discipline get you through negative times; control your mind. The enemy of improvement is boredom, fatigue, lack of concentration and must be overcome.
Technique includes timing, distance, speed along with breath, but technique without faith and discipline will take the longer path to improvement