What is a good treatment for dull skin tone and dryness during the summer?

Hello

Maybe it's because summer has officially started, but lately my face has completely lost its vitality and looks dry and rough, almost earthy. It feels like all the moisture in my skin has evaporated because it's hot outside and I'm constantly exposed to the air conditioner indoors. Yet, it's so hot that I can't just leave the air conditioner on either.

No matter how much expensive, high-quality nourishing cream I apply before bed, the effect is only temporary; when I wake up in the morning, my skin feels shiny on the surface but still dry underneath. I found a self-diagnosis guide online regarding symptoms of skin dehydration, and when I checked the boxes, I found that almost all of them applied to me. ㅠㅠ

I've heard that in cases like this, getting treatments like nutritional injections or skin boosters that directly replenish moisture and nutrients from deep within the skin is the surefire solution, but there are so many types that it's really hard to choose. I would appreciate your recommendations on which treatments are best for restoring hydration and radiant vitality to the skin of older adults.