It is possible to develop ambidexterity later in life through more active use of your non-dominant hand. Most people practice by using the non-dominant hand to perform activities that require larger movements and then move on to small tasks using more control and precision. For some this is a lot of fun, while others may feel as though their actions are sloppy or in vain, but with time, patience and consistency the non-dominant hand can be used with ease or even equally as well as the dominant hand.
A part of the process of learning piano is bringing both hands to an equal level of playing. Many self-taught musicians come having learned to play only or mostly with their right hand. It is rarely a challenge to teach them how to play with the left hand, despite their perceived limitations. In fact misuse of the right hand muscles can require some un-learning and re-learning of proper right hand technique. So many times the hand that is perceived to be better may actually need a bit of correction or guidance, while the hand which was neglected has a clean fresh slate and progresses with ease. A good curriculum will teach piano students to play equally well with both hands no matter which hand is normally dominant.
Jodi Ann Russell, Ed.D., M.M., B.M., N.C.T.M. is an expert piano instructor who emphasizes mindfulness, relaxation, creativity and technique in personalized piano lessons and master classes online.