What should I do about my sensitive skin? ㅜㅜ

These days, looking in the mirror every morning brings more anxiety than excitement. There was a time when I could apply anything without any problems, but now even the slightest temperature change or lack of sleep makes my face red and irritated. Yesterday, I had an important appointment, so I took extra care of my skincare routine. But when I came home from work, my cheeks were flushed red, and I was really upset. I think I have serious sensitive skin. Now, I have a feeling I really need to take care of it. In the past, I'd buy any trendy functional cosmetics. I'd lavishly apply products with claims of brightening or elasticity, and even get dermatological treatments, which was a fun way to actively care for my skin. But lately, I've become more cautious about even that kind of desire. I carefully check ingredient lists and choose only the most gentle products to minimize irritation, but the occasional breakout or tightness is still unavoidable. When I try products packed with soothing ingredients but don't see any significant improvement, I know I have really sensitive skin. Sometimes, I sigh deeply, wondering if I'm right. It's frustrating how, in our busy lives, even the slightest stress or fatigue immediately sends a signal. I used to be able to recover quickly the next morning, even after an all-nighter, but now, I have to diligently moisturize for several days to get back to my previous condition. Perhaps it's because of the changing seasons, but the air is also dry, making my worries even worse. Do you understand that feeling when others say everything looks fine, but you're actually feeling a pang inside? It's not just sensitive skin, it's true sensitivity. It's making me think I need to relearn skincare from the ground up. Are there any tips for strengthening the skin barrier while hydrating it without irritation? Even if it's not a grand method, could you share some of your own small lifestyle habits or tips?