Our Lord Jesus fasted but was there ever a time when He was not humble...when He was seeking for humility?
But please note what you state in the first two sentences; the first you state that a person cannot just decide to be humble and in the second you state that it must be the work of fasting. Sorry, but foregoing eating is not going to make you humble. In fact, if you want to seek after humility you simply cannot find it. Humility is a chastening of the soul. It is God who humbles us so as to reveal what lies in our hearts.
In my mind there are precious few Christians today who really want God to humble us by revealing to us what is truly in our hearts.
If any man will come after me, let him deny himself, and take up his cross, and follow me. (Mt 16:24)Ask, and it shall be given you: seek, and you shall find: knock, and it shall be opened to you. (Lk 11:9)