Skin care that starts when you suddenly feel unfamiliar with the image reflected in the mirror.

Last weekend, I went on a long-awaited trip with friends, and while organizing photos, I was shocked to see how dull my face looked. In the past, I used to feel refreshed the next day even after staying up all night studying, but these days, even after getting enough sleep, my face still looks tired. I'm starting to think it's time for a more systematic skincare routine. The dryness from the office air conditioning has become particularly severe, and fine lines are starting to become more visible, which is making me anxious. I've tried using face masks and essences at home, but I often feel the limitations of self-care, which is a concern. Do you have any tips for maintaining a clear complexion when your condition suddenly drops? Do you have any skincare routines or recommendations that you've found most effective for those with concerns like mine? I'd appreciate any valuable experiences or advice.