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I know this is simplistic but...
Guo Jia doesn't get sick and die in 207 CE.
Guo Jia advises Tsao Tsao against fighting the historical Battle of Chi Bi (208/9 CE)
Tsao Tsao conquers northwest, west and south west China
Sun Quan surrenders/is defeated.
The capital is moved back to Luoyang.
Tsao Tsao appoints a successor and dies in 220 CE.
I know that it would be easy for a successor to just usurp the throne but a Chinese Shogunate would be very interesting.