Which literary element is most likely shown in the sentence When I first startedas a paralegal I was full of enthusiasm but now my supply of enthusiasm is getting close to empty?

The literary element most likely shown in this sentence is metaphor. The phrase "my supply of enthusiasm is getting close to empty" compares enthusiasm to a depleting resource, suggesting a decline in the speaker's motivation and excitement. This vivid imagery conveys the speaker's emotional state and transformation over time.