Those activities are a good start. Get hungry for more though. Notre Dame admissions can be tough to predict. I know plenty of valedictorians who were denied in favor of students with grades just slightly below that, but who had more "intangibles."
Also, like others have already mentioned. The personal statement is important because it gives you an opportunity (1) to demonstrate that you know what makes Notre Dame the place that it is, (2) why you would thrive and grow in that environment, and (3) how you could contribute to its mission.
So, in addition to studying for the next round of the SAT, you ought to look into identifying what Notre Dame has to offer and how you fit into that picture. It's a lot, and I feel for you, but it's worth it. It's so worth it.