What is the best, most effective treatment for atrophic scar? (Photo)

Hi, I would like to remove the trauma scar on my forehead, if possible (please see attached photo); if i recall correctly it was caused by accidentally hitting my head against a door about 30 years ago. I tried laser treatment (3-4 sessions over a 2-year period ) and I even did subscision (about 3 months ago); and yet, I haven't see any improvement at all. Kindly please advise if I should consider scar revision? Thanks so much in advance.

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