This might be too big of a technological leap for them. I say bring stuff related to Industrial Revolution era tech. They already know about steam power but they only use it as a party trick. Show someone in power what it can actually do and you might just make steampunk Rome! 😀

If you manage to buddy-up with Domitian before he becomes emperor in 81, he’d definitely change things up.

You predicted the eruption of Mount Vesuvius so he knows you’re not a hack. So he’ll probably believe you when you tell him he eventually gets assassinated.

From there, who knows where history goes. He definitely curtails the Senate even more so maybe the Empire enters the Dominate phase of its history 200 years early?

Maybe point Trajan and Hadrian out to him if he’s looking for competent allies/potential successors. Well, Hadrian isn’t born until 76 but you probably won’t butterfly him away in 1 year.