One interesting Amityville fanfic could be about a new family moving into the infamous house and slowly uncovering secrets that were never revealed in the original tales. Maybe they find hidden rooms that hold the true source of the hauntings.
First, do a lot of research on the Amityville story. Know all the details about the house, the supposed hauntings, and the different accounts. Then, come up with a unique angle. Maybe your story could be from the perspective of a pet that lived in the house during the hauntings.
The truth of the Amityville story is highly debated. There's no clear-cut evidence to prove it's completely factual. Some aspects might be exaggerated or fabricated.
Amityville is said to be true. But like many such tales, it's hard to verify all the details. Some aspects of the story seem too extraordinary to be completely factual.
Amityville is considered to have a basis in reality. Reports suggest that strange and terrifying incidents occurred there, but some also question the authenticity of the claims.