I realized that scalp care is also important for skin elasticity.
This might be a really unexpected tip, but I started taking care of my scalp to improve facial elasticity. I found out that the scalp and facial skin are connected, so if your scalp loses elasticity, your face sags along with it. So these days, every evening I apply a scalp-specific ampoule and gently massage with my fingertips or a gua sha, and surprisingly, this helps a lot with reducing facial swelling.
Cooling down the scalp brightens my complexion and seems to reduce hair loss when shampooing, so it's like killing two birds with one stone. Especially for those like me who started worrying about hair elasticity in their 30s, make sure to take care of your scalp instead of just applying ampoules to your face. Since your hair gains strength from the roots, my facial contours feel firmer as well. It might seem like a small thing, but it is a really important routine in the long run.