I have a super sensitive skin but fortunately I know what are the ingredients that I should avoid. it wasn't an easy task to pinpoint the guilty ingredients, I had many irritation episodes and bad skin days but no complaints! it's a process and I'm always learning new things.
for my case, I cannot use products that contain fragrance, plenty of essential oils, and alcohol.
what I'd suggest is try to stick to products that have a simple formula. the smaller the list of ingredients the better, because this way you won't have a difficult time trying to determine the cause of the problem. also, try to be consistent with your routine, don't introduce several new products at once. give your skin the time to get used to a new product before introducing another. and again, this will be of great help when you try to find the culprit. also, never buy things without fully researching them and reading the review online.
oh and one last thing, don't give up on your routine easily. I know how it feels when your skin turns bitchy and stops accepting things. it is a frustrating situation but instead of completely ruling out your routine as inconvenient, try to take some rest and opt for a medicated moisturizer like the Cicaplast Balm from LaRoche posay for a couple of days and then try once more.
I hope this helps. best of luck ❤