Reduction in overall facial volume and improvement in elasticity

Hello. I am writing to inquire because I am very concerned that my overall facial elasticity has recently decreased and volume has diminished, making me look somewhat tired.

My cheeks have become flatter than before, and my temples and under-eye areas appear sunken, causing my facial lines to become uneven. This makes my face look longer or older overall, which is causing me significant stress. I would like to find a fundamental solution through an accurate diagnosis to determine whether this is simply due to weight loss or a decrease in collagen caused by aging.

In this case, I am wondering which procedure would be more effective in resolving my concerns: fillers or skin boosters performed at a dermatology clinic, or lifting lasers such as Ulthera or Thermage. Since the approach likely varies depending on an individual's facial bone structure and skin condition, would it be possible to design the most harmonious treatment plan for me through a precise diagnosis during my visit?