[Routine Help] Trying to fade my PIE and results seem to have plateaued - what can I add in to push past this stage?

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Skin Type: Oily, prone to acne, PIE/PIH, and dehydrationI have a ton of PIE left over from mild acne which has thankfully now mostly cleared, which I've been trying to fade all year with limited success. I introduced TO's 23% Vitamin C about 2 months ago and was initially really impressed with the results after just a couple of weeks, but now the effects seem to have just... stopped.Has anyone else experienced this kind of "fading plateau", so to speak? If so, how did you get past it and are there any products you can recommend? (Please note I have previously tried azelaic acid of multiple strengths and had zero success with it, so I don't think that's an option). Current routine is:AM:- Wash face with water- Hada Labo Gokujyun Lotion- TO Niacinamide + Zinc- COSRX Advanced Snail 96 Mucin Power Essence- COSRX Oil Free Ultra Moisturizing Lotion- La Roche Posay SPF 50 Shaka FluidPM:- Banila Clean It Zero original cleansing balm- Hada Labo Gokujyun Foaming Cleanser- COSRX AHA 7 Whitehead Power Liquid / TO Vitamin C Suspension 23% + HA Spheres 2% (alternate nights, 20-30 min wait)- Hada Labo Gokujyun Lotion (2 layers)- COSRX Advanced Snail 96 Mucin Power Essence (2 layers)- COSRX Oil Free Ultra Moisturizing LotionExtras:- AHA 30% + BHA 2% Peeling Solution (once a week at night, in place of the AHA or Vitamin C)- COSRX Ultimate Nourishing Rice Overnight Spa Mask (at the end of my nighttime routine, only on days when I feel dehydrated)
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Submitted by samt96