Stop over-plucking or waxing
Let eyebrows grow out for several weeks
Trim only long hairs, not sparse areas
Use a brow serum with peptides or castor oil
Apply a small amount of castor oil nightly
Keep skin around brows clean and moisturized
Eat enough protein, iron, zinc, and biotin-rich foods
Stay hydrated
Avoid harsh makeup removal on brows
Brush brows upward daily to train hairs
Fill sparse areas with eyebrow pencil or powder
Consider minoxidil only with medical guidance
See a dermatologist if thinning is sudden or severe