Feng Le Ba, San Sui Zhangmen Ren?!

The sword-master Jiang Ziqi studied the blade rigorously until his cultivation breached the nine-heavens and he achieved golden immortality. However, when he reached the immortal realm, he was ambushed by a hundred other immortals and forced to fight to his death. Just before dying, he was able to reincarnate his soul into the body of a three-year old, who happened to be the anointed leader of the Wujizong Sect. (Source: Bilibili, translated)