Let your creative imagination go. Or use a title generator, if you feel like it. For me, deciding what the title of my story title is a sign. Like I can go on and write a story without knowing the title, and a few days later, I'm like, this is it! The title for this story! The most recent time this happened was last night and two days ago. I now have two titles for two books. Give me a basic laydown of you story, and if you want, I can help you come up with a title.