Regarding the skin, especially if you lost the weight quickly(GLP-1, surgery, etc), give the skin a good amount of time(6 months to a year) for the skin to regain some elasticity and tighten.
If, given sufficient time the skin hasn't tightened, your only two options to relieve the distress it causes you is either surgery or learning to accept that it's just an historic element of your long life and says more about your achievements than it does about anything negative.