My biggest stress is my double chin ㅠㅠ What procedure would be the surefire fix?

It’s making me so depressed because the sagging skin under my chin is so noticeable. It wasn't like this before, but lately, this dreadful double chin is my biggest source of stress. It’s not like I’ve gained weight, but my jawline is collapsing, so I hate taking photos and looking in the mirror. Home care and gua sha rollers just aren't working, so I’m finally considering getting a procedure at a dermatology clinic. What kind of treatment should I get to completely eradicate a double chin caused by loss of elasticity like mine? There are so many types that I have no idea what to choose. Please give me some serious recommendations from those who have experience with treatments that can get rid of a double chin discreetly while working!