Horizontal lines across my neck, not a direct result of aging itself, I'm only 32. What procedure will help? (Photos)

Morpheus8 treatments should help improve this area.  You should see improvement as treatments progress.  We also recommend using medical grade skin care products and wearing sunscreen every day.

there are a lot of options for this Including fillers, threads, moorpheus, and lasers. I suggest seeing an expert and starting at home enlighten peels with MTS dermarolling. See emeragecosmetics.com where we do free skincare consults daily.  
With significant neck sagging you would need a neck/face lift with muscle tightening (platysmaplasty). at the same time lasers (fraxel,  co2 or erbium( or microneedling RF (fractora, intensif) can be . performed to improve the crepe skin or wrinkles.  You need a formal consultation, as the neck can be treated with a combination approach:
1. micro needling and lasers for texture
2. botox, disport or xeomin to help platysmal bands
3. intensif or fractora RF microneedling for crepe skin and lifting
4. fillers like belotero, restylane silk, juvederm volbella to improve lines and folds
5. neck/face lifting if sagging is prominent or early starting +/- platysmaplasty (muscle tightening)
6. J plasma/Renuvion, thermiRF, inmode facetite for internal tightening
7. ultherapy and thermage for external tightening
8. regular Venus legacy, exilis ultra, or inmode forma treatments with facials to maintain tightness
9. PDO novathreads or silhouette instalift cone threads for lifting and long-term collagen production
see an expert for a full evaluation and treatment plan based on your individual situation and goals.
Best, Dr. Emer

Hello and thanks for your question. You may need a combination of treatments to get the result you're after however as a starting point a very fine filler injected superficially is your best option. As part of a plan botox can be used as well as energy based devices as you suggest,  Best wishes