go forward a few days to get the winning lottery numbers...
With my luck, I'd have gotten them for the wrong day.
Ah, but just going back and buying a ticket may be enough to change what number comes up.
A more sure approach would be to bring back intellectual property --- drug patents with research to back up, some tech stuff, software (video games and DOS, Windows, etc), probably old antique coins to finance (old bills being hard to acquire), maybe the exact location of big oil and gas finds to get cheap drilling leases . . . etc.
Some things wouldn't change.