One idea could be a story where Yuji and Nobara go on a special mission together in an unknown location filled with new types of curses. They have to rely on each other's strengths more than ever.
One idea could be exploring the backstories of the side characters more in - depth. For example, you could write about how Maki became so strong - willed. Another idea is to create an alternate universe where the curses and sorcerers have different power dynamics. Maybe the curses are the ones in control this time. And a third idea would be to focus on the relationships between characters outside of the main plot, like how Yuji and Todo's friendship could develop further in different scenarios.
A cursed mirror could be a great idea. A girl finds an old, ornate mirror at a flea market. When she takes it home and hangs it on her wall, she starts seeing a different reflection in it. Instead of her own face, she sees a distorted, evil - looking version of herself that seems to be getting closer every time she looks. Eventually, she realizes that the mirror is draining her life force.
One interesting idea could be the characters going back in time to prevent certain tragedies. For example, they might try to stop the deaths of some important characters. This could change the whole course of the story and create new relationships and plot twists.
Well, you could write a fan fiction that focuses on the backstories of the characters. For instance, what was Scorpius' life like before Hogwarts? How did his family situation, with all the rumors about his father, shape him? Or you could write about Albus' struggles at Hogwarts from a different perspective, perhaps showing more of his internal thoughts and insecurities as he tries to live up to his father's name.
There were a few novels similar to Cursed Antiques that were recommended. Among them were Book of Chaos, Spirit Realm Walker, Tang's Table, and King of Beasts. These novels were all suspense, horror, or mystery novels, with a similar theme and plot to The Cursed Antiques. However, these recommendations might not be comprehensive because the search results provided were limited. If you need more recommendations for similar novels, it is recommended to conduct a more extensive search or consult relevant professionals.