Prompts have always inspired me and helped me with my short stories, there are so many online and also books with them in. Have you ever thought of looking for specific genre prompts though? Here are some examples below that I have found on the internet and think sound very helpful.
Dystopian -The end of the world happened with the mass destruction of the power plants and a virus that runs rampant throughout the entire population.
Horror – Your driving on a country road. It is late at night. You are far from home. You realize, as you check your mirrors, there is a man you do not know, hiding on the floor of your back seat.
Romance – Write a story about a romance that develops while both the main characters are dealing with an addition.