The gospel of Jesus Christ encompasses much more than avoiding, overcoming, and being cleansed from sin and the bad influences in our lives; it also essentially entails doing good, being good, and becoming better. Repenting of our sins and seeking forgiveness are spiritually necessary, and we must always do so.
Many of the lessons we are to learn in mortality can only be received through the things we experience and sometimes suffer. And God expects and trusts us to face temporary mortal adversity with His help so we can learn what we need to learn and ultimately become what we are to become in eternity.
Testimony is the beginning of and a prerequisite to continuing conversion. Testimony is a point of departure; it is not an ultimate destination. Strong testimony is the foundation upon which conversion is established. Testimony alone is not and will not be enough to protect us in the latter-day storm of darkness and evil in which we are living.