[Alternative History + Time Travel + Datang + System + Fighting for World Hegemony + Huang Chao]
The protagonist is reborn as Huang Chao, carrying the "Huangtian System" (inherited by Zhang Jiao, focusing on mental skills, running the army with Fu Shui, and gathering people's hearts) and the "Imperial Age System" (focusing on the technology tree, system tree, and military upgrades) to fight his way through the troubled times of the late Tang Dynasty.
When autumn comes on September 8th, I will kill all the flowers after they bloom. The incense formation soaring to the sky penetrates Chang'an, and the whole city is covered with golden armor. - General Soaring to the Sky
The new book tells a different story about Gao Neng, the most ruthless man in the late Tang Dynasty - Huang Chao. Worth a look