Answer:
improve
Explanation:
"I've heard this conversation before, the next time I visit.
you'll show me the best merchandise to <em>enhance </em>my
strength, dexterity, and awareness."
Here, enhance is used as improve. You can tell because if we replace it this sentence still makes sense. Hope this helps, have a nice day :D
Here it is replaced:
"I've heard this conversation before, the next time I visit.
you'll show me the best merchandise to <em>improve </em>my
strength, dexterity, and awareness."