Maintain a calorie deficit
Lose overall body fat
Eat more protein
Reduce sugary and processed foods
Drink enough water
Limit alcohol intake
Improve posture
Practice chin tucks
Do neck and jaw exercises
Strength train regularly
Get enough sleep
Manage stress
Chew sugar-free gum
Avoid prolonged downward head posture
Consider facial massage
Consult a dermatologist
Consider non-surgical treatments
Consider liposuction or surgery if needed