Unfortunately, there's not a ton you can do for the neck. Surgery or thread lifts are often the only things that give significant results. Topicals or microneedling might offer slight improvements. Botox can be an option, but it really depends on the cause of the neck issue. It's not a one-size-fits-all solution.
My neck is due to volume loss in my cheeks, so I don't think Botox is the right choice for me. Filler might help lift my jowls. I've also been trying tretinoin, GHK-Cu, and estriol cream with minimal success.