Would MyEllevate or FaceTite help correct sagging skin in the neck and chin or will I need a neck lift? (photos)

You are wise in reluctance to undergo necklift surgery at such a young age; besides the expense, it is not without its risks for adverse reactions, such as infection, scarring, etc. and the need for repeat surgeries in the future. RF devices, as I have emphasized on many occasions to my regular followers, are expensive and the hard science to back up all the heavy marketing hype and social media buzz that surrounds them lags well behind the hype. So, buyer beware with this, as well. And, thread lifting has a very high chance for adverse reactions, such as skin puckering, dimpling, infection, etc., so be cautious with that option, as well.
You would be wise to research Nonsurgical Filler Necklifts, where considerable improvement can be achieved, depending upon the specific issues, using a robust HA lifting filler, for pulling up and tightening the skin and more centrally biostiumulatory HA fillers combined with--only if necessary--with Botox, if vertical platysmal bands are present.
Make sure to consult with an experienced, board certified cosmetic dermatologist filler expert and ask to see his/her personal befores and afters prior to agreeing to proceed. Hope this helps and best of luck.

From the limited photographs, you have platysma muscle cords, fat deposits in your neck, and significant laxity of your skin. Noninvasive treatments cannot accomplish addressing all three of these issues. You're going to require a lower face and neck lift procedure, which accomplishes tightening loose facial and neck skin, tightening loose facial and neck muscles, liposuction to remove the fat deposit in the neck, and lift the jowls.