Basic skincare products good for restoring the skin barrier

This product is the Illiyoon Probiotics Skin Barrier Essence Drop. I have been using this product for about four years, ever since my skin barrier completely broke down. It is reasonably priced, so it is great for using liberally, and it absorbs quickly, so I find it fine to just apply this during the summer. I didn't used to get acne easily, but my skin barrier completely collapsed after I experienced some stress. I started using it back then out of sheer desperation, but because it is gentle and suits me well, I have continued to use it to this day.