Merriam-Webster defines habit as a "usual way of behaving: something that a person does often in a regular and repeated way." Basically something that someone already does, almost without impulse. This must be why habits are hard to make and keep.
First, you need mindfulness - to remember to do a new thing regularly and with repetition.
Second, you need commitment - to overcome the inertia which likely derailed prior efforts.
Third, you need conviction - to maintain priority over so many other tasks vying for the same scarce time
Then, after about 66 days, that new thing has a fighting chance to become something done often in a regular and repeated way.
According to that measure, I'm only about 1/3 of the way there. Hoping there are many more days of mindfulness, commitment, and conviction to get there in this year of growth.