Breast strengthening exercises and a proper support bay fitting bra both can help. Can try these for 2-3 months and see. If not you can approach a plastic surgeon for further management

Hi dear how much of weight did u lose? Dou have any thyroid or PCOD issue? Hope you do eat well n aren't following any particular diet plan.

Kindly discuss for your concern

Though the size of breast depends on various factors like genetics , body mass and proportion, fat contents and physical activity etc. and hence It Is multifactorial . Similarly treatment or breast reduction or sagging breast reduction/ tightening also depends on  various factor. Some of Hormonal therapy may be advantageous.besides exercise , There are oils which needs to be massaged on alternate day , and medicine to be taken will tighten the sagging or loose skin . Surgery can be the last option if not improve with medicine . Consult me for full  advice and prescription.

Kindly consult me for better evaluation

Good afternoon Try to take consultation