I got into fanfiction (& writing) specifically due to the long hiatus between the potter releases… there was a three year gap between GoF & Ootp & subsequent books. So mine’s basically a “continue the story and speculate” type of story. Now that OotP & others have released, I do have more of canon to leverage (characters, places, etc), so I do that, however, plot wise, it’s still post GoF story, not Ootp or later. (And my story’s likely reaching the 1.4M mark tomorrow…. on my drive)