Three Kingdoms: Heaven's Mandate Returns to Wei

(This book is also known as Reborn Genius: Starting at Guandu, Heaven's Mandate Belongs to Cao Wei. If you enjoy it, add it to your library. Your support motivates the author! Thank you.)

On a spring night in the fifth year of Jian'an, Guo Jia wakes from a violent fit of coughing, but his fingertips are no longer stained with blood. He remembers clearly that he died on the way back from the northern campaign against Liucheng. Yet now he hears the drums of the Battle of Guandu echoing across time. Bamboo slips on his desk still carry the fresh, gentle scent of ink from Xun Wenruo... Though the river of history has already changed course, the enemies he once faced are emerging from the mist, bearing murderous intentions he knows all too well...

(This book does not focus exclusively on the protagonist. I believe that in that era, anyone could be the main character. The characters are based on historical figures, but this is a fictional retelling, so some changes are inevitable. Please don't complain if that's not to your taste.)