Consider reaching out to sympathetic professors, colleagues, friends. Okay, I said 10, but here is one more. Don't believe the myths. Clients come to me every day with these misconceptions. If it was, there would be no research base.
Successful dissertations deal with relatively common topics.
The original work comes from your specific empirical study. The successful dissertation writer works until the document is as good as it can be. She submits her work for review even though it isn't perfect, and expects helpful feedback from her advisor. As to the last, and perhaps most damaging myth- it is based on an outmoded concept. It was seen as a rite of passage involving constant demands for rewrites and revisions and even total changes in topic.