As for what product to make… well, that was indeed a bit more of a question. When Di Tou thought of massively resounding successful products on Earth, his mind would naturally turn to technology. Computers, phones, tablets, or social media apps, but obviously none of that would work here. Even if he somehow had the technology to make a working smartphone without satellite dishes, cellular data, and wifi, what would the point be?
Even if all of those things were up and running, this wasn't an information era civilization, to suddenly introduce these things wouldn't make anyone happy or suddenly be treated as a miracle invention. It would just be strange…