squats alone won't really do it. Also it's a big muscle that heals really fast. You can work it almost daily as long as you switch up what you do. Put in things like deadlifts (if you feel it in your lower back you're doing it wrong), squat cleans, push press, box jumps, rowing etc. Anything that will force you to use explosive hip motion as well as leg strength will improve your ollies greatly.
Whatever you do, make sure you work both legs equally.
Here's an example workout
Deadlift your body weight 12 times
21 box jumps (21")
Repeat 3 times
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