how to turn my abs from a 4-pack to a 6-pack?

i have a 4pack and no matter how hard i exercise how well i keep my diet i can’t get it into a 6 pack. i work on my abs constantly i do crunches on the swiss ball for the upper abs, and hanging knee raises for lower abs, i also do cardio, i eat healthy constantly, i play a lot of sports, i drink protein shakes i even take vitamin pills. i have been doing this for about 5 years now since i was 15 and i still have a 4 pack. i can’t get a 6 pack. i don’t want to take steroids or anything like. my arms are pretty well built i work out my legs a lot too because i don’t want them to be too skinny, my chest is pretty built but my abs are still 4 pack. how do i turn it into a 6 pack?

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