I am 6'1 and mostly white. I have been able to dunk since I was 16 at 5'10.
The biggest thing is to learn how to jump. I am a one foot glider. I jump best off of one foot and gliding to the rim.
I don't have much explosion upwards so I need to be running to get high enough to dunk.
If you are 6'3 there is no reason not to be able to dunk unless you are young, injured or fat.
Lower your body fat %, increase your leg and most importantly your core strength and then learn how to jump. There are a lot of different ways to get explosion and a lot of that is what you feel comfortable with.
Good luck!

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