Final answer:
Gregor holds onto his job as a traveling salesman in "The Metamorphosis" because of his sense of duty to provide for his family and maintain a semblance of normalcy.
Step-by-step explanation:
In "The Metamorphosis," Gregor's most important reason for holding onto his job as a traveling salesman is his sense of duty and responsibility to provide for his family. Despite his own transformation into a monstrous insect and the negative treatment he receives from his family, Gregor continues to work in order to support them financially and maintain a sense of normalcy in their lives.