Do not commit the error, common among the young, of assuming that if you cannot save the whole of mankind you have failed.
If my children do not behave according to Islam, if they do not pray for instance, I will punish them.
But it is nice to know that you have other races lined up, because sometimes you can get so focused on your next marathon that it can become kind of unhealthy in some ways. So it's nice to have something else to slap you in the face and say, all right, there is life after the Olympics.