How can you become an expert at something if you’re not interested in it? I have no idea, which is why I recommend you follow your passion. More passion sets a higher ceiling on where your skill and talent can go.
Habits can be good or bad. When good habits are applied to a craft they can lead to craftsmanship and when bad they can cause all sorts of problems for you. The repetition of habits leads to muscle memory. It moves conscious thought to the unconscious and allows you to respond automatically and without thought.