I think I would prefer to go back in time on this continent and bring a more primitive civilization forward. The Aztecs thought the Spanish were Gods and that’s a safer bet.
You could bring the civilization forward while quietly converting them to Christianity.
Bring small pox to the continent in 1015 and let them develop immunities and ways to call with it. Then let thee people develop and see what happens when the Colombus, Pizarro, and Cortes types venture into the Americas. Bring breeding populations of horse, goat, and cow with as well.
Wouldn’t that get you a featured place in the Book of Mormon?
I’d add cane sugar to the Aztecs’ cocoa drink and become king of the world in 5 minutes. After that, they’d have a harder time burning me at the stake for crazy ideas.