One option is to look back at your story's themes and find a way to bring them full circle in the ending. Also, consider surprising your readers with an unexpected but satisfying twist. Or, simply have a peaceful and conclusive scene that leaves them with a warm feeling.
Well, you might start by thinking about what the core message or lesson of your story is and end it in a way that emphasizes that. Maybe have the main character achieve a major goal or make a big decision that shows growth. Another approach could be to leave the ending open-ended, allowing the readers to imagine what happens next.
You could think about tying up loose ends and giving your characters a sense of closure. Maybe have a final confrontation or resolution that wraps up the main conflicts.