Ideas are everywhere all the time. There isn't enough time to do them all! Perhaps reexamining your goals for your writing would help. Being able to write for the love of it is huge. Also, consider doing a wide range of reading on HP and otherwise. Even if you are not interested in the topic, read hubs (and more) with the goal of gaining insight into finding your voice that just can't shut up. :) Finally, seek to write meaningfully about topics that will make a positive difference in people's lives.