Sometimes writers are asked where they get all their ideas. Most writers I know find this rather hilarious. Ideas are everywhere. Unique ideas are all around us, because human beings think and perceive things differently.
Look around! I guarantee there are some good story ideas in your vicinity right now.
I sometimes teach a workshop on speculative fiction. A great writing method is to combine two disparate ideas to create a more unique story.
I'm actually participating in a short story challenge right now where another writer gives us all a story prompt and we have to write a story within seven days. Phew! It is challenging. A lot of the prompts are not topics I would normally write about.
But it has been great for getting my creative juices flowing.
So, if worst comes to worst: ask someone else for a story prompt.
Good luck with all your creative ideas!