Well, the denial was certainly brief and to the point, huh? I am really sorry, jci. I know how much time and effort (and money) you put into your case.
I think that it all ends for you here, however. The Michigan Supreme Court was your last legal option.
Your defamation case was not a strong one to begin with and, although I think your case raised some issues that the Supreme Court may have found compelling given a different set of circumstances, the result of your defamation action would have been the same either way. The published letters, to my mind right from the beginning, were not defamatory. They were fair comments and criticisms based on a matter of public interest. I do not believe any defamation action would have been successful based on those letters alone.
Your next course of action may be to write about your experiences. You have certainly spent a lot of time these past few months doing research, and you have gained a lot of knowledge about Michigan's court system, how to represent yourself pro se, how to file a legal action and pursue it, how to file appeals right up to the Supreme Court. Your experiences, encapsulated, could provide others, facing the same task you have faced, with a valuable source of information.
It is something to consider, at any rate.
Again, jci, I am really sorry the Michigan Supreme Court did not grant your leave to appeal.