If it is indeed mild mitral regurgitation/mild mitral valve prolapse with no symptoms at all international guidelines mandate no more than an echocardiography test every 3-5 years. You should otherwise lead a full & normal active life.
If you do have palpitations a Holter test is recommended. Other symptoms might have a bearing on the frequency of echocardiography and also the need for other investigations or treatment.
However, no specific treatment is recommended if there are no symptoms. General advice such as ensuring good oral health with dental review every 6 months is recommended.