How effective is Skin Botox?

I can feel my jawline elasticity dropping significantly just from getting a year older, so I get a huge reality check every time I take a selfie. My cheeks are sagging slightly, casting shadows around the corners of my mouth like bulldog jowls, and the boundary between my jaw and neck has become blunt, making my face look bigger overall. Expensive laser lifting or thread lifting is too much of a burden, and I'm afraid of the side effects. I'm drawn to procedures that use dense threads across the entire face to really boost elasticity. I'm wondering if this procedure actually provides a lifting effect where the cheeks become firm and the jawline tightens up. I'd also like to know if anyone has experienced side effects where the corners of the mouth don't lift or the smile looks awkward and robotic because the threads were injected incorrectly into the shallow layers of the skin. Additionally, I'd like to know if there are any specific tips for finding a doctor with excellent surgical skills.