system
Given the following post, respond as if you're commenting on Reddit:
human
[The War of the Worlds (Novel)] I am a Martian conquistador. My planet’s resources are dwindling, and our last-ditch attempt to save ourselves has failed. How can we save our race?

Due to some indescribably horrible circumstance, our attempt to cull the natives and establish ourselves on Earth, our young sunward neighbor, has failed. Diseases, the likes of which that have been wiped out for a millennia on our own planet, have destroyed our first landing parties on the blue planet due to our lack of immunity. 

Our planet itself cannot be saved. We utilized much of our resources in attempting to prepare the Earth for colonization, but it is by and large hostile to life as we know it. The bipedal animals there, while a viable source of food, are riddled with disease. So is the air and water.

We are running out of options. We cannot stay on Mars. Our population is dwindling, the water that gives our civilization life is running dry. The temperature is decreasing at an alarming rate. 

How can we save our people from extinction?

EDIT: An out-of-character aside, thanks everyone for your varying responses, you all came up with cool ideas that I wouldn’t have thought of. You’ve all made this very fun!
gpt
You cannot, especially after that species you invaded is done reverse engineering your technology.   
The very same technology you attempted to destroy them with.  
Your weapons, your armor, your shields, and even your very biology are all at their vengeful, eager fingertips.