Fat grafting to breasts with loose skin, good idea?

My breasts started sagging in my teens due to weight issues, and I finally had a breast reduction almost two years ago after a huge successful weight loss.

While it lifted my areolas up and my breasts indeed look better, the loose skin is still massive and I hate it. My breasts aren't firm at all, and my old big stretch marks are even more visible due to my loose skin.

Would fat grafting be a good idea in this case? I just want them to look and feel more firm.