We need to learn how to see habits not as a line to cross but as a lifelong development. In that, we shift the focus from acquiring a habit of maintaining the habit.
A habit acquired can be easily lost if not cultivated and maintained. It’s not the achievement of the habit but the cultivation that is key.
An easy allegory for that would be to think of ourselves as a farmer and our lives as the land in which we will plant good habits.
A farmer knows that if he sleeps during the sowing season he will not reap the benefits later on. If he does not cultivate his/her land nothing will grow healthy and strong. Habits are just like that, the fruits of a good farming attitude.
Sow them, water them, work on the land and reap the joys. After, you will have to repeat and keep in doing. Practice for the rest of your life until it becomes your destiny.
“Your mind will be like its habitual thoughts; for the soul becomes dyed with the colour of its thoughts. Soak it then in such trains of thoughts as, for example: Where life is possible at all, a right life is possible.” Marcus Aurelius
That is the only way to change for the better, keep those changes and live a prosperous lifestyle.