A lot of people fantasize about meeting jesus or saving rome or killing marx if they could time travel, but I'd personally sell little modern day trinkets like firecrackers, mountain dew and fidget spinners from a tent on the edge of towns. People wouldn't really be impressed, they'd think plastic is some sort of foreign wax . I would be very openly religious and even go as far as joining in a pogrom or two, And after some 30 days, before too many questions are asked or some historically relevant person arrived, id leave back through my time portal with a notebook full of historic data, recordings of daily life and ancient artifacts.
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>Columbus died thinking he was a failure who never made it to India I’d go tell him what he actually found on his deathbed. Man deserved as much