The Dao dies but I live on, the spiritual energy dries up but I remain evergreen

(Longevity + no system + non-exciting story + witnessing the exhaustion of spiritual energy + slow pace + relatively plain) (This article is from the perspective of an immortal, experiencing and witnessing the stories and characters of each stage after the spiritual energy is completely exhausted.) You have experienced the prosperity of spiritual energy, the rise of all races, and the glory of the world like the stars in the sky. But have you ever experienced the exhaustion of spiritual energy, the withering of all laws, and the death of the great way? Have you ever seen the huge immortal dynasty gradually become mortal? Countless sects disbanded, and the monks in the world tightly guarded the spiritual energy and stayed at home? Have you ever seen ants dare to exchange their lifespans with the emperor, and the monks struggled to seek reforms. A hundred schools of thought, demons, immortality, and death persuasion... The exhaustion of spiritual energy is a...