Please tell me the secret and treatment to get rid of double chin~

These days, whenever I take a picture, my double chin is so prominent that it stresses me out.

I'm researching double chin reduction procedures because my face doesn't lose fat no matter how I exercise. But the sheer number of options and the varying reviews are making me even more anxious. If anyone has experienced the benefits of non-invasive double chin reduction, I'd like to know what procedures they tried, what the pain and recovery process was like, and how they'd describe the treatment. I'm worried about side effects, so I can't make a hasty decision. Are there any methods that can definitely help with my double chin reduction?