hey so sorry I haven't got back to your last message, but here are some ideas for you ^-^
• write your self into harry potter
•make a character that you have come up with and write her/him into harry potter
•make twin story
•write a next generation of Harry's kids
•if you get this far I'm a book over your own character, write there next gen
hey sorry that's all the ideas I had but I do suggest reading Lumos a guide to harry potter fanfic before you start writing, that book gave me ideas for things I would want to happen! hope that helps friend!