Unfortunately, despite of numerous remedies to improve thickness and texture of skin like yours, results are very limited. Repeated treatments with ablative laser, deep chemical peels, micro needling, dermabrasion, are remedies that should be tried; no single treatment is going to be successful and fulfil all expectations. Injection of nano-fat grafts (high concentration of stem cells derived from fat grafts) into fine neck lines have proven to create visible improvement in this area, but usually needs to be repeated in 6-8 months. In person consultation with a board certified plastic surgeon familiar with this technique is recommended. Good luck.