I Have Liver Skills and Become a Superman in the United States in the Post-Apocalyptic World

Zhao Shan was reborn in the beautiful country decades later. He was found to have been shot in the head with a gun and thrown into a shallow pit. After regaining his life, he was thirsty and hungry, and could not even walk a long way. At this time, the system popped up and saved his life, and gave him skill proficiency progress. He discovered that he could quantitatively improve many skills such as shooting and fighting. As long as you are willing to work hard, you will definitely become stronger. Inaccurate shooting? Liver! Liver to hit every target! Can't use a lightsaber? Study! Liver! Holding a dagger to block bullets? Study! Liver! ... If this trend continues, can we make waves? Can it fly? Am I going to become Superman? ! Right! Become superman!