Practice. Draw at least one picture per day ( even if it is just a head )
Ok you probably heard that before, but practice really does help you get better at drawing!
Something else you can do: Draw an anime character and after you're
finished drawing do this. Look at the picture and try to see how you can make it better. For example, maybe you're not very good at anatomy, but you can draw the face very well. After you notice the flaws in your drawing, look up tutorials on youtube and try to improve your flaws.Just keep practicing! If you continue to practice everyday, in a few years you will improve alot!
Sorry I'm not very good at explaining things.