About Current Routine for Combination Acne-Prone Skin

I get breakouts here and there but my main concern is post-inflammatory hyperpigmentation. I have found that this current skincare routine has not irritated my acne-prone combination skin and has reduced the number of new blemishes (especially after I added the YTTP Mandelic Acid Exfoliant to my routine). However, I haven’t really noticed a significant change in my dark spots so I am considering adding a Vitamin C serum and Retinol to my routine. I have also been struggling with dark circles and have not really noticed a difference with the CeraVe Repair Eye Cream after 3 months of use.