Losing the contest just means one judge preferred something else on one day. Enter the next one.

A single result carries far less information than it seems to at the moment it lands. Who was in the room, what they had already seen, what they happened to be looking for: all of that shaped the outcome, and none of it is a stable measurement of your work. Treating one decision as a verdict gives it more authority than it has.

Let the disappointment be real and short. Then send the same work somewhere else, since another attempt usually costs little and the last result told you almost nothing.