Completely lost with skincare and don’t know where to start

Hi everyone, I’m completely lost with skincare and I don’t really know where to start. Right now I use a serum from The Ordinary (niacinamide + zinc) and a CeraVe moisturizer, but honestly I feel like they’re not doing much for me.

I have a lot of little red marks spots on my face, and I also think I might have something similar to rosacea because my skin gets red and sensitive (specially after a hot shower or temperature changes) but I’ve never had it checked so I don’t want to self-diagnose.

My skin also feels really dry and flaky. The weird thing is that the more I moisturize, the more it feels like my skin depends on it. If I forget moisturizer for even one day, my face starts peeling a lot. I don’t know if my skin barrier is damaged, if I’m using the wrong products, or if I’m just missing something obvious.

I really love the Korean glass skin look, but I have no idea how people actually get there, especially with dry/sensitive skin. I don’t want to buy a million random products, so I’d love help building a very simple beginner routine and knowing what ingredients or products I should look for or avoid.

Thanks so much in advance. I’m genuinely starting from zero here, so any simple advice would be really helpful.