How to manage wrinkles and elasticity around the mouth?

Lately, even just wearing a hat or mask leaves marks on my face for a long time, makes it look less elastic, and gives my complexion a shadowed look. My mouth and facial areas, in particular, are deeply sunken, and my skin elasticity is really poor. I've gained weight and I'm trying my best to take care of it, but it's still tough. I'd like to know some good skincare products or skincare tips.