Architect. I would have loved to create buildings. Of course in a ridiculously unrealistic 'big picture' kind of way - not the person who designs the HVAC vents and such details.
Although architecture does come into my real job to some small degree, so I'm not entirely unfulfilled.
And having watched my way through Time Team during the first lockdown I reckon I could stride across a field in wellies saying things like 'These sherds of Samian ware in the north range are undoubtedly evidence of late Roman settlement, but now we're down to the natural'