You need to change the game.
Chase a different type of lady
See a private
Use a different routine
Experiment with methodology
Do a runner
Offer low sums and see if you get a bite or tempt the untemptable with a higher sum
Try a ladyboy
Try a guy
If you are looking for an adrenaline rush and this isnt doing it for you anymore and you need excitement you have to make the event unpredictable. If its not in the ml/sex world
Try these new synthetic death drugs
Pick a fight with a 20 year old
Put a sum larger than you are comfortable with on a wager, casino, tab...has to be in person, not online.
Of course this is not without danger or risk, even your mortality is on the line with some of these suggestions. But as we get older the need to feel alive can wither. Look at how many walking corpses you see out there. These suggestions are probably way beyond your comfort zone, but you either want a thrill or you dont.