How to restore the skin barrier

I developed chronic dermatitis from improper sunscreen use, and it seems like my skin is becoming more sensitive and my skin barrier isn't recovering properly. A few days ago, I got a sample of a sunscreen I was curious about, so I tried it. I wondered if it had the wrong ingredients, and my skin started to feel itchy and irritated. I washed it off quickly, so the blistering subsided without any problems. However, my skin barrier isn't recovering easily, and the surface feels like plastic and is so dry it feels like it's going to tear. I'm only applying Estura cream, but is there any way to quickly recover my skin barrier? If you have any tips for skin barrier recovery, please share them.