Looking for mild serum for acne scar fading

Hello! First time posting here, so I hope I'm doing this right. I have been using the Vitamin C Glow Brightening Serum from Cocokind for nearly two years now. I usually use it in the morning with my SPF moisturizer, and I love the glow it gives, but it doesn't lie well under makeup, and I don't think it has been very effective in fading my acne scarring. I use tretinoin so my breakouts are infrequent and mild, but the scars last for such a long time, even if I don't mess with them, and they're starting to accumulate. All that said, I am looking for some other serum to help fade the scarring and also have some sort of brightening effect. I have sensitive combination skin, so I am very wary of exfoliants and things that might irritate me or disrupt my skin barrier, but I would love any and all advice for people who might be experiencing something similar. Thanks!