Well, one way is to start with a unique character and imagine what kind of adventures or challenges they might face. Another approach is to take a common theme and give it a twist. For example, if it's a love story, make the circumstances unusual. Also, observing people and their behaviors in real life can inspire original story ideas.
You could look at current events or historical events and ask 'what if' questions. Like, 'What if this historical battle had a different outcome?' That could lead to a unique story. Or, try combining elements from different genres to create something new and unexpected.
Just let your imagination run wild. Think about things you're passionate about or experiences you've had and build a story around them.