Hi Betty, nice to meet you
It is understandable that it's hard to believe that time travel is possible and indeed and to travel back and warn people...
And surely going back in time you would have pondered exactly that, and perhaps chosen a date to arrive, where you could say 'tomorrow this and this will happen...'
For example, if I could go back and warn people about 9-11, I would seek something specific in the timeline that I knew would happen, it didn't needed to be any big thing, just something very noticeable and specific...
And if it did happen as said, people would know you were telling the truth...
In these days there are so much BS and crap, so we need to question everything, even ourselves... And it is only a good thing that we do, so that we stay sharp...
I will not just close my heart to your message, but some sort of proof of your insight in the timeline would be appreciated by many...
Otherwise you'll only be considered a troll...

Lots of love to you