Just the usual advice, lay off the porn, eat a bit better, do some exercise, drink a bit less, pack in the tabs, improve your general health. That all assumes you don't already, if so good on you
Maybe you are just a one pop guy, in which case embrace it and work on your stamina. Make it clear to the escort that you want to cum later rather than sooner. I often tell them to slow down because I don't want to cum yet.