What was it - 10'000 hours of practice to get good at something? Or was it just 1'000 hours?
Anyway, practice, practice, and then practice some more. If you practice your drawing 1 hour every day for example, and keep that routine up for some years, you will certainly see a massive improvement year to year.
If you cannot put up with such a rigid regime, you might go to some hour per week, but you will of course slow down your progress.
I would put it like this: the fact you are not already good at art just means you do not have enough of an urge to draw to really get good at it. Which is not such a problem, maybe you only discovered recently how fun drawing is.
But that is front and center to getting good at anything: if you love doing it, you will do it more often. Thus you will gain more expierience, which in turn will make you better at it, which in turn will make you enjoy it even more.
EDIT: Of course, studying the right techniques and tricks is also important. But ONLY if you are constantly trying to use what you learned in practice. Many try to get better by reading books and theorycrafting. Without the massive amount of practical expierience by just doing things, AND trying out new tricks, this will all be for nought.
There is no real talent involved with great artists. Some might start at a different level because they have a firmer grasp on some things (maybe because of thing they learned as small kids, IDK)... most of them just started drawing at a young age and never stopped drawing while other kids where busy doing other things. Thus they reach adulthood with some "magical talent" that came from constant practice.
My personal regime is: If you suck at something, and want to get better at it, just force yourself to create a quick doodle every day. I suck at drawing faces while I am pretty decent at drawing characters otherwise. So I set myself a goal to paint/draw a face every day for a year, and see if I can get a firmer grasp on how to draw faces in that time.
I'd like to be able to paint a fully shaded, good looking face in about an hour. Lets see if a year of practice is enough to get to that level of skill.