Will any procedures help to smooth my neck? (Photos)

If a platysmaplasty was done three months ago with wide undermining, there may have been skin laxity that was not optimally re-draped, and that skin is now re-adhering to the platysma. Or the platysma may not have been sufficiently released so it is still banding across the neck angle.
An in-person exam and review of the operative details would be helpful if you wish a second opinion.
Sometimes liposuction or defatting of the neck can be excessive and make the skin look too thin.
Options, after an in-person evaluation, would include allowing at least six months for healing an softening of the neck skin/muscle interface. Treatment could include minimally invasive non-incisional cannula undermining and re-draping of the neck skin over the muscle.
Sometimes fat grafting can improve the appearance of thin skin or irregularities noted after platysmaplasty.
If at some time, revisional surgery was felt necessary, MyEllevate would be an option for undermining and platysma release without surgically separating the skin again from the underlying muscle.

A tightening device like Sofwave will help for the deeper layers and a non-ablative laser like Resurfx will help the skin surface.
Regards
Dr. Janjua

to me, this looks like you have some residual skin textural issues in your neck. a true face/neck lift will not address that (alone) -- therefore, doing treatments to work on improving the skin texture will likely be what you need to explore next. this may be RF microneedling, lasers, etc.