There would be very strict rules governing time travel.
You could look up information, but not post or otherwise transmit data NOT found in that current time frame.
You could do research in that current time frame, query for specific information, but not put up information not already present.
Flipside, in “many worlds theory”, any decision leads to a split in the timeline.
One timeline where someone took action “A”, one timeline where they did not.
So even IF you DID go back in time, you may not be in “Your” past.
You would be in the past of “alternate you”.
Now how to get home?
No such thing.
You can’t.
“Your” home timeline is now unfindable.
Congrats, you’re now lost in time.
Enjoy your stay in the current time frame.
[Pinging a bunch of writer types to help elaborate on what would govern time travel]
Something interesting. A Korean show involving time travel, the woman who went to change her past was told by the guide that when she returned to the future that time would return to the way it had been before she left.
Statistically, there SHOULD be several instances of documented time travel,...unless it really is true, in which case they would have returned and erased all such trace.
(Of course, now that this has been posted, either it must be erased, or allowed to remain as will other posts documenting time travel, so it might be not believed....)