What is happening
You are noticing a normal change
If your skin looks a little slacker than it used to, that is not a flaw to fix overnight. Collagen production slows over time. Skin gets thinner and holds less water. No cream will turn back a clock.
What a good routine can do is support the skin you have, and make firmness look a bit more even from month to month.
Here is the honest version: results from topical care are gradual and modest. You are more likely to see a difference in texture, and in how light sits on the skin, than a dramatic lift.
If someone promises a lift in a week, be careful with that promise.