Prolonged Post Inflammatory hyperpigmentation 8 months post co2 laser - how can I improve this? (Photos)

Hi, I have had co2 laser on my face about 8 months ago. The procedure was not done by a certified doctor or nurse and the settings were obviously too high and have not healed at all. I have red/brown big squares still on my face now 8-9 months post procedure. It healed a little in the first 2 months and now has been slow and no progress. I am very concerned. I always put spf 50 to protect from sun. Please help me with what topical treatments I could use. I have tried hydroquinone, tretinoin and azaleic acid but feel like it irritates my skin more...I would need some help please