What is good for strengthening the skin barrier?

Whenever the seasons change, my skin feels dry and dull, makeup doesn't apply well, and my skin temperature fluctuates up and down. It seems to be especially worse as we transition into autumn and winter.

Could it be because my skin barrier has weakened?

I'm curious if strengthening the skin barrier will make it less sensitive to temperature.

Lately, my face feels hot and my skin has become dull, so I'm worried.

What can I use to strengthen my skin barrier? I'd like to make my skin healthy, but I don't know what to use.

I just use toner, lotion, and an ampoule for my basics, and keep it simple with BB cream or powder.

Not investing in your skin would be a problem as well.

Please share tips or cosmetics that help strengthen the skin barrier.