Can't change a habit by persuasion

Telling someone directly to change a habit never works. You cannot use persuasion on someone --or yourself-- to change a habit. Habit is action and action always wins against reason:

Simple information, reasoning, and appeal to fear of negative consequences are not enough to dissuade a high sensation seeker from trying some risky behavior that promises an intense reward. Once established a habit that provides reward is difficult to extinguish because of the negative emotional and physical state produced by withdrawal of the reward.

If you are to make some behavior off-limits and therefore remove the reward, then you have to replace it with another rewarding behavior.