How do you all keep your skin moisturized?

Whenever winter or the changing seasons arrive, I repeatedly experience severe skin dryness and flaking. I feel dryness even in areas covered by clothing, such as my arms, legs, and back. Even after frequently applying moisturizing creams or moisturizers, my skin often feels tight, stinging, or itchy very quickly. Sometimes, scratching causes wounds, making my skin even more sensitive and appearing to react acutely to external environmental factors. I wonder if my skin barrier is weak or if there is an issue with my lifestyle habits. In addition to basic care like applying moisturizer immediately after washing my face or showering, I would like to know if there are any areas I can improve in my overall daily life, such as diet, sleep, and hydration. What kind of care would be effective for maintaining healthy skin from within and preventing severe dryness?