Is there anything i can do to slow down aortic valve stenosis from progressing?

No: It is a degenerative disease sometimes lipid lowering agents have been suggested to slow the process.

No: Unfortunately there's nothing you can do. Continue regular follow up with your cardiologist. Based on the aortic valve morphology, current degree of stenosis, and your age your doctor should be able to tell you the expected course, progression and prognosis; but still impossible to know for sure.

Not really: Avoid rheumatic fever in childhood avoid birth with bicuspid valve it is a slow progressive hardening and calcification of abnormal, or even previously normal tissue. So there is not much we nor you can do.