60kg female on 80mg of accutane a day - 6 months and not responding! (photos)

I had moderate acne. I had first month with 20 mg per day, then 2 with 40mg, 2 with 60mg, 1 with 80mg. Accutane made my acne worse at first A LOT. Now have no more blackheads or whiteheads, I continue to develop cysts and have had 7 cortisone shots on no longer active ones! I am taking with food, I eat healthy, drink loads of water. Why am I not responding to this treatment, ? How much longer should I be on it? Should I up my dosage? Also concerned about scarring