I recommend "The Soul of the Han Dynasty at the End of Jin Dynasty", a historical fiction novel, to you. The main character is a historical otaku from the IT Department. He transmigrated to the era of the Five Barbarians. With the 3,000 iron cavalry given by the system, he had to defeat the 300,000 Xiongnu people who besieged Luoyang. Only then could he release the 5,000 years of history and historical figures of China. This novel meets your requirements. It has the level and data of the main character, and there is no plot to summon the character. I hope you like this fairy's recommendation. Muah ~π