Holy grails for very old hyperpigmentation / dark spots?

I’m quite new to AB. My current routine is anuaa toner -> manyo galac niacin 2.0 essence -> numbuzin no. 5 concentrated serum -> dr g’s soothing cream + non AB sunscreen in AM routine

I’ve been sticking to that routine for the past ~6 months but I’m only seeing some very slight improvements, mainly for newer acne. My old acne spots from +5 years ago have remained mostly unchanged and I think I have to switch products to particularly target them so please tell me what are the HGs for very old hyperpigmentation like this :’)

My skin type is combination; mostly dry but oily on the nose and forehead. And I have acne-prone sensitive skin

(edit: added info about my skin type)