I have been fighting my hyperpigmentation from hormonal cystic acne scarring for years, what helped me most was:
-peels (which you mentioned you’ve done)
-sunscreen everyday (another one you’ve done- yay!)
-lightening creams, applied by q tip only in the spots I need them. I’ve used pond’s clarant B-3 dark spot correcting cream and AMBI fade cream for oily skin.
-lemon juice!!! This is the biggest one for me- 100% lemon juice applied as a toner to the spots. I would leave it on overnight but I had spots all over my face.
-hyaluronic acid as a moisturizer- I have no idea why but this has made my skin seem to even out. It may not have the same effect on just a spot.
Again these are just in my experience so they may not be perfect for everyone! (: hope they help, tho.