Earth Abandoned? I'll Turn It Into a Planet-Ship Instead

When humanity flees a dying Earth aboard eighty massive starships, one man is left behind on the scorched planet. While billions escape to Mars, he discovers something they missed: Earth itself can become the ultimate vessel. Alone against impossible odds, he'll transform the entire planet into a colossal starship, proving that being abandoned was humanity's biggest mistake. Sometimes the greatest journey begins when everyone else has already left.