Rebuilding the Tang Dynasty

Since the Qin Dynasty, the dynasty has only lasted three hundred years. Is it a curse? Or fate? After the Anshi Rebellion, the Tang Dynasty really had no way to recover? Is the eunuch's dictatorship really like a monolith? Cliques are fighting each other, with no room for turning? Hebei vassal town is really an independent kingdom? Guests come from outside the world, time and space change, and destiny has quietly changed...