One way could be to check the trash or recycle bin of the platform where the stories were posted. Sometimes deleted content might end up there temporarily.
You can try using social media platforms. Many people share their stories there. Just search for relevant keywords or hashtags related to friends' stories.
Some official websites or forums related to the 'Sakura Avalon Friends' might also have sections dedicated to fan creations, including fanfics. Explore these areas thoroughly. Additionally, following fans who are known to be into this series on platforms like Twitter can also lead you to discover fanfics they might share or recommend.
You can also check your email exchanges or maybe even old diaries or notebooks where you might have jotted down these memories. It might take some time and effort, but you could find what you're looking for.
To find the best friends fanfiction, it's a good idea to join some Friends fan groups on social media platforms. People in these groups often share their favorite fanfictions. Additionally, check out blogs dedicated to Friends. They might have reviews or recommendations for great fanfiction. When you do find a story, read the reviews from other readers to get an idea of its quality.