You go back in time and tell [person] that [bad thing] will happen if they don't [do something]. As soon as they are convinced, you vanish, because in the new timeline, there was no need for you to go back in time.
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Each time the person swings doubtful, you reappear to persuade them again; but you can never remain corporeal long enough to convince them permanently.
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Right up until the moment [bad thing] actually occurs, your poor subject is still wobbling between 49% and 51% doubtful. Despite your repeated interventions, you've been unable to reduce the chance of catastrophe lower than a coin toss.
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So I show them this thread and they’ll know I disappear the moment they’re convinced!
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That *might* work. However, we should probably assume that any objects you brought back in time will vanish along with you. So you start showing them a print-out of this thread...but you and the print-out vanish before the person can finish reading.
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the Road to Damascus Problem
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