One way to generate good story ideas is to combine elements from different genres or concepts. For example, take a classic fairy tale and set it in a futuristic world. Or take a real-life event and add a magical twist. Another approach is to start with a unique character and build a story around their desires and conflicts.
Well, you could start by imagining 'what if' scenarios. For example, 'what if everyone had superpowers but couldn't use them in public?' Also, try combining random elements or concepts to come up with unique ideas. Like, a space adventure combined with a love story. And don't forget to draw from your dreams or daydreams, they can be a goldmine of creativity!
Read a lot of different types of stories and observe the world around you. Inspiration can come from anywhere, like a conversation you overheard or a unique place you visited.