Overcoming bad habits is not just from the mindset is also by your actions, it can be tough to overcome bad habits but here are some ways i know that can make it easy for you to overcome bad habits.
once you have got the mindset actions will come later on it has always to be mind over body for you to overcome these bad habits you speak of
you can try to reward yourself in progress to overcome this habits,
setting short term goals will make it seem achievable and less intimidating and rewards can even motivate you even more
just don’t aim too high too soon because you will fail if you try to set yourself up to unrealistic goals