First off - How tall are you?
I got my first dunk at 14, but It helped I was over 6’. However, at that point, I don’t know that I had done any routine squatting. While strength certainly helps, I would add jumps to your regimen. From 16-17 I took my vertical jump from 23" to 34", by training with and being trained by world class performers. They had me do Long Jumps, resisted/assisted jumps, single leg jumps and jump rope. While my goal was to be a better athlete, a by product was my vertical jump improved drastically.