Answer:
Sergei did not always want justifiable and consistent things and ended up spending his wishes with other people and not with him.
Step-by-step explanation:
The theme of "What of This Goldfish Would You Wish" is that we must be careful with what we desire and if we have the opportunity to fulfill our wishes, we must choose them sensibly, without waste, because we will never know what we will need to ask over time.
Sergei develops this theme, always wishing for things that are not for him. He was entitled to three requests and did not ask for anything for himself, missing the opportunity to actually accomplish something he wanted. Furthermore, not all of his wishes were justified, showing that he wasted a great opportunity.