Double chin lifting effect to lift sagging jawline

My weight has stayed the same, but as I get older, I feel like I'm gaining weight and sagging under my chin, so my double chin line looks very prominent whenever I take a photo.
So I'm looking into fat-dissolving injections or lifting devices that are said to be good for jawline management, but I'm skeptical about whether they really have a noticeable effect on a double chin.
I want to experience a definite double chin effect that maintains a slim V-line for a long time, rather than just a temporary improvement immediately after the procedure.
If anyone has tried various treatments at Maypure and found their hidden jawline, please recommend which procedure was the most effective for a double chin.
I desperately need a real testimonial about the double chin effect so I can get rid of my face shape complex and have a smooth jawline!