My skin is sagging; is there a routine that is good for elasticity?

Hello. I have combination skin that is prone to dehydration and breakouts, but my skin elasticity used to be pretty good. However, perhaps because I’m getting older, I feel like I’m losing elasticity and my skin is sagging. It seems to be getting worse now that winter has arrived. My cheek used to recover immediately if I poked it with my hand, but lately I can feel a significant drop in firmness. In this case, what kind of routine would help restore it? I’d appreciate it if you could let me know—whether it’s diet, topical products, or daily routines. Thank you.