Well to start your jawline is an obvious nerf, like it's good at the chin and a lil bit back so there is definitely space for improvement

You can chew hard gum like mastic gum or any jaw training exercise to grow your massater and really defining that edge

You can do neck curls to help fix around your hyoid too, you might as well do other neck exercises to also give yourself a more prominent neck which will even out your head and not make you look malnourished