If the point is to blow people’s minds, I’d take a gold plated Apache helicopter and materialize in year 0 at the top of Mount Olympus. I’d fly my golden chariot, circling Athens a few times so everyone notices, land it at the Parthenon, and emerge in a flight suit. Minds blown.
That'll boost economy and the rest will follow.
If folks have no grasp of what you bring it'll be scary and condemed. Upgrade what they already have and that will really boost their lives and accelerate the scientific evolution.
Remember that in an evolved society only a select few are making food and that frees the hands of the rest to develop and prosper.