Would I want to change my body? What for? If I don't know the purpose of this life how can I know the best possible way to achieve it? Why should I consider myself wiser than whatever it is that created me, be it an impersonal Mother Nature or a personal God?

Besides, the question is irrelevant. It doesn't matter what I do to my body, I'm going to die anyway. If there is another life on the other side, then my only concern is not to regret my actions in this life. I don't need genetic therapy to be able to be proud of my life after I die, my guess is that I only need love and wisdom. On the other hand, after death there might be just a big nothing, in which case no genetic therapy will make any difference.

The only case in which the question seems pertinent is if I were an atheist that lived under the illusion that my life matters. Then I'd think that learning music would be extremely important, ignoring the fact that anything that I learn will soon be forgotten forever. Now that's self-delusion. Is there a genetic cure for that?