Well, you could start by thinking about your own experiences or dreams. Also, reading a lot of different books and watching various movies or shows can give you new perspectives and spark ideas. Another way is to combine different elements or genres to create something unique.
One way to get good story ideas is to ask 'what if' questions. For example, 'What if time travel was possible but had unexpected consequences?' Also, imagining alternate realities or putting familiar characters in unfamiliar situations can lead to interesting ideas.