How can I become an immortal just by playing a game?

Makino brought the game system soul to the world of immortality and became a handyman disciple of a low-ranking sect. With no hope of becoming an immortal, he simply gave up and immersed himself in the game world.
In reality, he is a low-level immortal cultivator, mining, weeding and farming every day, living the mediocre life of Immortal 996.
In the game, he killed everyone. In [Sword and Demon Sealing], he chopped the demons from all directions with one sword and became the savior of the world; in [Under the Sky], he refined the Zhenwu Dharmakaya, shattered the sky with one punch, and was named Taixu Martial Ancestor; [Beast and Beast] Tian Qi] transformed into a giant beast to devour the heaven and earth, ruled the beasts from all directions, and became the supreme among beasts...
Live and work, until one day.
"Hey, how did I become an immortal?"