How did Westley the farm boy become servant on the farm in The Princess Bride?

In "The Princess Bride," Westley, the farm boy, becomes a servant on the farm after he leaves to seek his fortune and make enough money to marry Buttercup, the farm's owner. However, he is unable to achieve his goal, as he is reported dead while working as a cabin boy for the Dread Pirate Roberts. Upon his return, he takes on the role of a humble servant, disguising his true identity and abilities to navigate the challenges he faces in the story.