@bruceandruth1970, you ask a great questions and are receiving good information from several others. I tend to back up a step and address what ‘best’ means, particularly since I do not know anything about your personal situation (assuming you are asking for yourself).

Mayo Clinic has a good overview of mitral valve regurgitation if you haven’t had a chance to review it.
https://www.mayoclinic.org/diseases-conditions/mitral-valve-regurgitation/symptoms-causes/syc-20350178
They state surgery is not always necessary. I want to draw your attention to their approach of assessing symptoms, disease severity and structure of the valve to determine treatment goals of helping the heart work better, improve symptoms and prevent complications. This may, or may not include surgery or other type of procedure.

Are you dealing with mitral regurgitation? If so, would you share some about your situation?