What task would you excel in if you lived in the Stone Age?

Well, cavemen also need tech support, just a different kind of tech.

Gork: "Stick go thud. I want go stab"
Pepsison: "Have you tried rebooting it?"
Gork: "?"
Pepsison: "Sorry, old habit" Sharpens his spear "try it now"
Gork: "Gork happy. Gork bring you mammoth"

And with Gork happy I'm sure he can help you find the right twigs twine and logs to make a primitive cart. Soon you and Gork can haul all the mammoth you'd ever need.

Maybe you could build a wooden bicycle.