I'm telling you, this is how the movie should end.
Earth is destroyed, fucked obliterated. The last vessels of humanity are forced into space with the technology they have gathered over 20 years, entire derelict fleets are floating in orbit from what ever battle happened in the movie. Years go on, we take the remanence of their fleet that is in space and on Earth and create a home among the stars.
The movie has one last scene, Goldblum and Co. are in the heart of a destroyed mothership and find a star map that shows all of our local immediate cluster showing the trail of dead planet after dead planet, a perfect path of where they have been, showing once flourishing worlds completely obliterated by the aliens.
And then you see Goldblum start following the trail, and it ends on a single planet. It's not dead, it's atmosphere is habitable to humans. It's the aliens home planet.
"Now it's time for us to destroy their national monuments"
Independence Day: Homecoming