Well, How Did I Become the Savior?

The protagonist Lin Yuan possesses absolute combat power at the level of "Destroying the Century", but due to system settings and his own cognitive bias, he firmly believes that he is a weakling who will die suddenly at any time. In order to survive, he stacked up his armor crazily and over-prepared, but he could always inadvertently use "mortal means" to suppress world-destroying disasters, triggering crazy speculation from all forces.