One interesting Spy x Family fan fiction could be about Anya making more friends at school in a really unique way. For example, she uses her telepathy to help a new student who is shy and scared. This fan fiction could explore how Anya's actions affect the new student and also how it might change the dynamic in her class a bit.
You can start by looking on fan fiction websites like Archive of Our Own (AO3). There are usually a lot of tags and filters you can use to narrow down the Spy x Family fan fictions. For example, you can filter by rating, whether it's completed or not, and the type of relationship you're interested in reading about.
Well, Spy x Family fanfiction can be really interesting. Some fanfictions might explore different relationships between the characters in more depth. For example, they could focus on the bond between Anya and Loid in a new situation that wasn't shown in the original manga or anime. It's also fun to see how authors play with the spy and assassin themes in unique ways.
Spy x Family manga has wrapped up. It provided a conclusive and fulfilling storyline that wrapped up all the loose ends. Now you can binge-read the entire series without any interruptions.