Is it a habit or a skill?
The first step is deciding whether what you’re trying to improve is a habit, skill, or mix of the two.
A good rule of thumb is that if your main problem is with doing something you already know how to do, but doing it consistently, that’s probably a habit. If your main problem is not knowing how to do something well enough, that’s probably a skill.
For example – exercising is a habit, although there is some skill in it too. Speaking another language is a skill. On one hand, reading is a habit—you need to read more. But it’s also a skill—vocabulary, fluency, and subject familiarity all influence how quickly and deeply you can read.