Alternative Rebirth: Leading the People to Restart Civilization

[No system + no powers + no rebirth], please be careful before entering if you mind. Groundless accusations of sexual harassment ruined He Chuan's studies, and a diagnosis of advanced gastric cancer put him on the road to death. Cryonic volunteering may be his only option, but when he wakes up, the world has turned upside down. Civilization collapsed and rules were rebuilt. But what does it matter? This is the opportunity given by fate to He Chuan to be reborn. Make tools, build cities, form armies, save people... He used knowledge to restart human civilization in this barbaric wasteland!