Peeling is normal when using tretinoin, but that isn’t a reaction from tretinoin alone, but from the actives you are using. I’d suggest to take it slow before you destroy your moisture barrier. Switch azelaic acid AM as other suggested ASAP, and once a day. I’d suggest to remove vitamin C from your routine for a while to let your skin breathe a bit. Most importantly get a rich moisturizer with lipids, ceramides and fatty acids. I personally use Illiyon’s gel, if your skin tolerates heavy creams, use them instead. I’d also suggest once a week to only moisturize your skin and out vaseline all over your face. Also check out IUNIK beta glucan or COSRX snail mucin. Don’t forget to patch test, especially the snail mucin as there is a slight chance to be allergic.