The aortic stenosis is not the cause of the cardiomyopathy, and even though it needs to be watched over time, without any evidence of aortic valve disease or aortic disease, it is unlikely to progress. The cardiomyopathy should be worked up carefully. I think that you should see a cardiomyopathy specialist. You should definitely be started on an ace inhibitor. It may not lower your blood pressure at all, but it will make it easier for your heart to pump blood. The sotalol is a decent beta blocker and you should probably stay on it. There are many causes of cardiomyopathy ranging from completely unknown to familial and even congenital causes. Careful history taking, physical examination and an imaging evaluation are necessary. There is some blood work that also needs to be done. Again, consider seeing a heart failure specialist.