My Xiuxian painting style is not right

After the great war between immortals and demons, the immortal realm was severely damaged, the demon realm vanished, the demon clan retreated into seclusion, the ghost realm was restless, and the mortal world's spiritual energy was thinning, and cultivation was declining. Chen Yu traveled through time and space into the body of a useless man who was bent on death, and unexpectedly embarked on a unique path to immortality...