How is zhu changed by the journey to the west

I believe the answer is that Zhu Bajie becomes better version of himself and is given reward of being the “Cleanser of the Altars”.

In “Journey to the West”, Chinese novel written during the Ming dynasty (16th century), attributed to Wu Cheng'en, Zhu Bajie (Pig) doesn’t achieve enlightenment as his fellow pilgrims. Although, Zhu becomes much improved version of himself, he is still too much a creature of his base desires. As a reward for his pilgrimage's success, he is rewarded with a job as "Cleanser of the Altars" and all the leftovers he can eat.

the jewellery thief was as cunning as a fox.

explanation:

"as cunning as a fox" is the simile, because it compares two things using the words "like" or "as" to do it.