If you can't think of something for your story, just let it go for now. Who knows, maybe you'll suddenly get this amazing idea for it a couple months from now?
I can really understand how that would be hard. Seven characters would fry my brain. I think the only reason I get to update A-A-G is because I *looks ashamed* put everything else on hiatus until I finish. Except for my original, Dante's Muse, which is just starting. But I just can't write any of the other stories, I'm stuck on all of them, so I selfishly put them on hold.
Ah, but you update all the time! I'm subscribed to AAG. Me, writing this story is SO much fun, but really tiring since I have 7 main characters and 7 POVs each chapter.
I hate not being able to update. It bugs me so much because I want to write, like, really really badly, but I just...can't. Makes me want to throw the computer out the window.