How can one strengthen their relationship with Allah to solidify their faith, and remove doubt, sorrow, and despair, and achieve success in life?

Anxiety and depression may be a result of distance from Allah and dereliction in His rights, for life without Allah is misery. The cure is to return to Allah through repentance, and not to despair of His mercy. Among the most important ways to get rid of sorrow are frequent remembrance of Allah Almighty and reciting the Holy Quran, for it is a healing for the hearts. It is also recommended to increase seeking forgiveness and remembrance, to supplicate during times of answer, to accompany righteous companions, and to listen to beneficial Islamic tapes.