Answer:
survival
Step-by-step explanation:
One of the strongest driving forces for change would be survival. The need and want to survive can push any individual to change nearly any aspect of their lives. This includes bad habits, everyday choices, relationships, work etc. Any aspect that is hurting their ability to live a healthy and happy life can hurt the individual and trigger a survival instinct that can push them towards drastic changes in order to achieve that better life that they want.