Make use of lip balm, lipstick, and other things that don't cause irritation to your lips.
Several times a day, especially before bed, apply a lip balm or moisturiser that doesn't irritate your lips.
Apply a lip balm with SPF of 30 or more that is non-irritating before venturing outside.
Sip a lot of water. You should drink plenty of water if your lips are chapped and dry.
It may seem normal to lick one's lips to moisten then when they feel dry, but doing so can make the condition worse.
Your lips are already sensitive, so metal objects like paperclips, jewellery, and other commonplace items might aggravate them.
You can benefit greatly from having a humidifier in your bedroom, particularly if you breathe through your mouth at night.