There's nothing software-wise you can do, you'll have to clean your laptop and buy an internal/external fan. Also do it ASAP, you're killing your CPU
Make sure you're not running the game on the iGPU (Intel HD Graphics). Try enabling / disabling multicore rendering. Try capping fps / turning V-Sync on.
How long do you have your laptop and how often do you use it for high intensity programs or games? 83C isnt too bad as max temperature but definitely not optimal, i dont know much about laptops but my first guess is that the thermal paste efficiency isnt as good because of constant use.