Here are few things I recommend.
First is to exfoliate, I like to use the Lush one in mint julips. Second is to apply lip balm regularly, I always carry a Smith's Rosebud Salve in my bag. Lastly, at night I use an overnight mask, I'm currently using Laneige Lip Sleeping Mask .
The dry and cracking lips is too much embracing. So, if you want to improve the beauty of your lips then I would like to recommended you to use custom lip balms. They are available in multiple flavor that will keep your lips glossy. You can use these lip balms every day without any problem.