Eat a lot of meat, diary, and take a multivitamin to make sure you aren’t deficient in any nutrients. Sleep literally as much as you can, drink plenty of water, get outside and be active, and make sure to mew, nasal breathe, and chew mastic gum (1 piece on each side of mouth) or use a set of leveled jaw pad trainers daily (the mechanical stress of chewing hard stuff during puberty will help your whole face develop better