I recommend "Xuan Qing Tian Dao" to you. This is a Xianxia and Cultivation novel written by the author, Lord Xiao Chen. The main character, Li Wen, transmigrated to the Untainted Land and became Pangu Xuanqing. He became the one who escaped and found a chance of survival for all living beings in the Untainted Land. The 50 Great Daos mentioned in the novel and the 49 Heavenly Divination are very consistent with the plot you described. I hope you like this fairy's recommendation. Muah ~😗