"With realisation of one's own potential and self confidence in one's ability, one can build a better world"- Dalai Lama
Most efforts to change fail simply because they create actions with short term effects - sometimes that last only hours after the training course or exercise.
"What the superior man seeks is in himself; what the small man seeks is in others" – Confucius
More often there is a model to which you are required to conform. This model may not fit your self concept - your idea of who you are. If you cannot believe that this model is who you are all will remain unchanged.
If you always do what you've always done, you'll always get what you always got
The secret to sustained success is to build change around who you are and your natural talents