A few things:

First, what do you value? You are more likely to stick to patterns and decisions when they align with what you value.

Second, some habits are like dominos. They set off a chain reaction of other habits, often unintentionally and subconsciously. Identifying which “keystone” habits start this cycle is critical to hijacking your brain’s attempt to go on auto pilot (that’s all habits are-your brain is trying to work less)

Third, willpower is finite, as you may have already discovered. Know that any habit you are trying to change or eliminate must be replaced with a new habit. Use the first two points to guide this concept.

Finally, The Power Of Habit is a fantastic book that outlines these concepts in more detail. Another is Dr!ve by Daniel H. Pink, which elaborate on extrinsic and intrinsic motivation. You might find value in one or both titles.