Others grind levels while I cultivate immortality

I’m retranslating this novel because existing translations (there is one on WebNovel for example) suck ass.

Synopsis: Transmigrated overnight into a world where games have merged with reality. Everyone can class-change into a Professional — clear dungeons, kill bosses, and level up.
Su Xing class-changed into the sole hidden class: Cultivator. He enrolled in Great Xia’s top academy, expecting smooth sailing ahead. Unfortunately, Su Xing simply cannot grind mobs for experience. Four years of university later, he’s still a lowly Qi Refining cultivator, struggling to even graduate.
Fortunately, he awakens a cheat — the “Life Simulator.” By spending energy, he can simulate the future and bring back cultivation progress, items, and more into the real world.
But in every simulated future, fifteen years from now, the alien races launch a full-scale invasion and humanity is annihilated overnight.
Armed with his cheat, Su Xing chooses to lay low and develop steadily, continuously raising his strength through the Simulator. He becomes a hidden power behind the scenes, quietly fighting against the coming invasion…
PS: This is a simulator novel, leaning toward anti-trope farming/development and behind-the-scenes progression.