Which sentence of Tianjingsha Qiu Si can be used as the crowning touch of the whole poem, and what kind of feelings does it express?

Heartbroken people are the crowning touch of the end of the world. In the village in late autumn, a wanderer appeared, leading a thin horse on the desolate ancient road at sunset, wandering around in the face of the biting autumn wind, sad, but did not know where his home was. It reveals the sad feelings of the poet's unsatisfied talent and appropriately expresses the theme. This poem uses the method of scene lyricism to render the atmosphere, express the theme, and perfectly express the melancholy of travelers who wander the world.