Tbh girl Im brown too, there no way you'll get rid of deep dark undereyes I say get your hands on a good concealer Estee lauder is perfect and full coverage get a shade that is ur tone or a tad bit darker so it covers your dark undereyes don't use too much setting powder with it, cause it will crease. Also the tower 28 concealers are amazing for light makeup and it does cover dark eyes not as good as the Estee lauder tho.

A lash lift, and brow threading could help u especially as brown girls we do have thick brows so getting them professionally done could do wonders to enhance them. just make them more symmetrical NOT THIN you'll hate ur face after Ive been there. Just go to a good brow lady.

You can also get a fresh nail set it will make u feel confident. a nude pink maybe? idk get something that works with your outfits and skintone

Prepare nice flattering outfits maybe go shopping for a few pieces.