After Earth was destroyed, I roamed the universe for eons alongside an AI

[Soft Sci-Fi + AI as System + Ensemble Cast + Creator Figure + Civilization Building + Massive Scope + Technological Advancement + Interstellar War + Biological Ascension + Galactic Hegemony] Earth was destroyed by an unknown ray; Yan Xia, the sole human survivor, embarked on a cosmic odyssey alongside Ella, the artificial intelligence aboard his spacecraft. Constructing interstellar warships spanning ten thousand, a hundred thousand, and even a million meters; building colossal interstellar cities stretching across tens of billions of kilometers; scaling the heights of countless technologies; and uncovering the truth behind Earth's destruction... Uniting dozens—even hundreds—of civilizations through advanced technology to forge a mighty federation, commanding hundreds of millions of stars, and waging war across dimensions... Each voyage spans millennia, and every battle is a strategic contest lasting tens or hundreds of thousands of years. This is a journey through the cosmos beyond all imagination—an epic saga of humanity’s rise to the pinnacle of the universe!