Hard to say with little detail. How much sagging are we talking and is it caused by age, weight, kids etc? Its hard to really give you a good answer without knowing more about your circumstances

I’ve been noticing sagging skin since menopause. I’ve started using RoC Anti‑Sagging face Cream, and over time my skin has started looking firmer and healthier. I’ve seen a real improvement, and it’s now become a regular part of my morning skincare routine. Body products with caffeine or peptide complexes can help with the appearance of firmness and for a smoother texture, even if they don’t deeply tighten tissue.

It really depends where on your body and how much sagging skin you are talking about.
After having children my stomach skin sags big time. I tried everything including exercise and decided to mention it to the Doctor one day who infromed me that the only way to get rid of it was surgery. A tummy tuck as they call it. I saw a plastic surgeon who said that no amount of exercise would remove the sagging skin. It had to be surgically removed. I decided against such a big surgery but obviously many people decide thats the road for them.