A good prompt might be to change the setting of the story. Maybe it takes place in a different time or location. Or, consider giving a minor character a much larger role and see where that leads.
You could try imagining a sudden plot twist that throws everything off course and then figure out how the characters would respond. That often gets the creativity flowing again. Also, think about what if the main character had a completely different goal or motivation. How would that shape the story?
One prompt could be to think about a new character entering the story and how that changes the dynamics.
You could do a character interview. Imagine you're interviewing your characters and asking them questions about their feelings and motivations. This can give you a deeper understanding of them and lead to new plot developments. Another option is to make a mind map of all the possible directions the story could go. It can visually show you different paths to take and help you decide which one to pursue.
One helpful exercise is to take a break and do something completely different, like going for a walk or listening to music. It can clear your mind and give you fresh ideas.
One prompt could be 'Describe a character who has a unique quirk and build a short story around how this quirk affects their daily life.' For example, a character who can't stand the color yellow. Every time they see it, they freeze. This could lead to all sorts of comical or tense situations in a story.
Take a break and clear your mind. Maybe go for a walk or do something unrelated to writing for a while. Sometimes, stepping away helps you come back with fresh ideas.
Take a break and do something completely different. Sometimes, a change of scenery or activity can give you fresh ideas.
I'd say go back and review your outline or character development. Sometimes getting back to the basics helps. Also, try freewriting about your characters or the setting to get the creativity flowing again.
One tip is to have a clear plot in mind before you start. Know where your story is going and what the main conflicts are.
Some programs that could be beneficial are Evernote and Google Docs. Evernote helps with note-taking and organizing ideas, while Google Docs provides easy collaboration and access from anywhere. Also, apps with built-in timers and goal-setting functions can be useful for staying on track.
One great love prompt for fanfic could be 'Two characters from different worlds fall in love during a journey together.' This allows for a lot of exploration of their differences and how love can bridge those gaps. For example, in a fantasy fanfic, a human and an elf might meet while on a quest to save their respective lands. Their love story can then be intertwined with the challenges of the quest and the cultural differences between their races.
One sex prompt could be 'A forbidden love between a vampire and a werewolf that leads to a passionate encounter in a moonlit forest.' Another could be 'Two characters from different historical eras are brought together by a magical spell and discover a new level of intimacy.'