Good question.

The only way humanity survives is leaving the solar system, since without Earth, all we have here are dead rocks, gas giants, and shitty little moons.

1. Everyone everywhere needs to shift focus to one thing: storm your govt buildings, bases etc. and figure out what they know about UFOs and anti-gravity. Without new physics we're trapped here with Elon and his chemical rockets to nowhere.
2. Spread this info as far and wide as possible and try to anticipate the problems that will arise when trying to move 8 billion people from one planet to another.
3. We would need groups focused on:
   • what planet do we even go to?
   • do we need ships or is a portal possible?
   • is there a safe zone in our solar system where we can spread to temporarily?
   • how do we keep the world running for the next 5 years while we evacuate?
   • are you aliens going to fking help us out here or just watch??
4. Find out what the world govts knew about this, and tell the world how they lied to humanity.
5. Bring a copy of the timechain.