Everyone has their own system of belief. It’s formulated by the experiences we’ve had or have not had with whatever we’re choosing to believe in or not believe in, or wist to out opinion.
Write about someone with the opposite opinion of something than you. Any opinion/belief. or method of belief.Flesh it out so the reader can understand this belief. Then change the character’s mind. How? Why? What could possibly make them change the way they feel about this thing.
Bonus points: Write about someone with the same opinion/belief/method of belief as you and change it to the opposite of what you believe/think. Same rules apply.