(Concern) Chest fat grafting surgery

I used to have about a B cup in the past, but since I started exercising for dieting, my breasts have also shrunk along with my body ㅠ Now, I think I have about a tight A cup ㅠㅠ Also, when I was dieting before, I didn't know about sports bras, so I wore regular bras and jumped around a lot, which caused my breasts to sag ㅠㅠ I haven't even gotten married yet, but my breasts sag, and it stresses me out a little when I see them in the shower ㅠㅠ I'm also very curious if fat grafting surgery can help lift sagging breasts at the same time