After Becoming Invincible, I Discovered That the Outer-Domain Demons Are from My Old Home, Blue Star

One heroine or no heroine + strong protagonist + fast power progression (not an invincible protagonist story, primarily told from the perspective of his clone)

Xu Yi transmigrated into a fantasy world and reached the peak through his own efforts. Then came a story of being invincible on earth, only for enemies from the heavens to arrive. As the battle went on, he realized something was wrong.

Looking at a starship bearing the emblem of Blue Star in the void, Xu Yi thought, “Isn't that my home?”

Xu Yi cultivates a clone and rises to the top of the Blue Star Federation.