I think you need to take the same approach as the British during WW2 with the Enigma. They could decrypt the messages and know when attacks would happen, but if they stopped every attack, the Nazis would know and change encryption device. So you need to accept that some people will die and only mitigate the disaster in small but impactful ways.
Fuck that. Start mining. Don't say a fucking word to anyone. Don't go overboard on mining. Or if you do, use it/sell some of it early. The only reason bitcoin became popular is because people used it to buy stuff. If you start talking about how it's gonna be worth 80,000 in 10 years you run the risk that more people will hoard it and it won't be worth shit.
Maybe also an evolved strain of the pandemic h1n1 virus. And more evolved versions of other viruses, too. That covid will be more evolved than the original pandemic strain, also. It'll have the transmission increases and immunity avoidance while in the novel virus stage, so going back to warn about covid could instead make it happen earlier and much worse (instead of just earlier). Plus all the other pandemics on top of that, and in a time that is much less ready to pivot office work to wfh.
We knew well enough that a pandemic was a realistic risk and had SARS-1 and MERS as warning shots but we're still not very well prepared at the outset of COVID.
It depends on how far back you go and who you contact about he incident and the evidence to solidify the claim.
9/11 could have been stopped relatively easily with a few days notice to national security. The air force could have shot both planes out of the sky. Just call the civilian deaths a tragic casalty of terrorism and use it to help fuel the war. The twin towers could have been shut down that day.
But you've gotta materialize right in front of the commander in chief, bring a mountain of carbon datable evidence like news papers and original classified docs, and hope that you don't get brained on the spot before you make your case.
As for covid, you probably can't stop it but maybe better warn and prepare world governments so they can get their population ready through subtle conditioning like trying to get wearing mask be a fashon trend or advertising bidets heavily as the new rich yuppie thing to show as a status symbol.
Scientists have been talking about a big pandemic for years before Covid. Nobody cared. If I ever get to time travel, I'll use it for personal gain. That's the only way something good'll come out of it.
Bringing evidence from the future is cheating. They wouldn't believe you if you told them the truth but if you say you are a terrorist and placed a bomb in the world trade center, they might evacuate it
You dont notify the government directly, you notify the news desks of MSNBC, Fox, ABC and the major newspapers. Do it via express postage envelopes a few days out, include any publicly available info on hijackers, flight numbers and times.
The Government might ignore it as a hoax, but not if they know that the information has come via every major news outlet in the country. They have to act.
But what could you do without throwing your life away? Basically you would have to hijack a plane to increase security. Regular appeals by a person claiming to be a time traveler... might not be taken seriously.
Go to the cops and prove you are from the future. Get there a few days early with the lottery numbers on a piece of paper or smth. That might get them to take you seriously. Of course they will never let you go back.
Just call with a bomb threat, they take that shit seriously and it would have emptied planes and buildings. Call the PD and threaten both towers, the pentagon, and the airport.
There’s a game around time travel called Quantum Break that brings up this topic.
Someone brings detailed messages to their past self…and acknowledges, as a way of proving it, that September 11 is going to happen - but due to the way time works, no matter who they warn or what they say, no one will believe them and nothing will change.
I don’t even know if everyone read that bit of text lore ingame, but it was pretty emotional.