The word צלח [success] relates to שלח [send] and סלח [forgive]. שלח is advancing towards a goal. סלח is also helping one advance in life because until there is forgiveness one is stuck in the past [both the forgiver and the sinner]. צלח is overcoming barriers to achieve one's goals.
Do you want to be successful in life? Establish goals, know that there will be barriers and then overcome them - with Hashem as your silent partner. Also - forgive. Don't hold grudges. It just keeps you stuck in a rut.
Let's see how Rav Hirsch explains Yosef's success: