Willpower is one way to change your behavior, to adopt new habits. Changing your environment is far easier.
For example, want to eat better? Stock your fridge with reasonable sized portions of the food you like. Don’t count calories and chastize yourself.
Want to get over your fear of heights? Move into a high rise.
Want to waste less time in pointless meetings? Stop attending meetings.
Want to bulk up? Join a gym with people that are bigger than you. Not the neighborhood YMCA.
Your environment shapes who you are and who you become, use it to your advantage.