Serious Acne Scars? (photo)

I have very oily skin and had a lot of acne. To correct the scars, I have tried deep chemical peeling 3 times, dermaroller 5 times, and Erbium laser 7 times. My skin now looks younger but I still have these scars albeit 'improved'. I do not want silicone filler and my current doctor is suggesting another session of derma roller. Is it the best solution for my problem or should I go with excision graft? Will continuing with 5 other sessions of Erbium help me? or will C02 be better? I am brown.

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