Sagging skin/fat between lips and chin - how can I improve this? (Photo)

I would need to see your entire face to give you a better opinion. If there is laxity if the neck and jawline you may be ready for a facelift. Also depends on your age

Fillers is probably your best option and has the great advantage of being temporary if you don’t like the outcome.
The underlying primary issue is insufficient structural support for the soft tissues because of an undersized mandible.
I’m guessing you have an overbite occlusion.
Including profile pictures would help.
I think you’ll just have to consult with a few plastic surgeons and see what they have to say.
I don’t think any type of facelift is going to help you. Best,
Mats Hagstrom MD