Option 1 -> "break the ice" means to initiate conversation or ease social tension, not relevant to dealing with defeat.
Option 2 -> "keep a stiff upper lip" means to remain brave and composed in difficult situations without showing emotion.
Option 3 -> "turn a blind eye" means to deliberately ignore something, doesn't fit the context of self-encouragement.
Option 4 -> "spill the beans" means to reveal a secret, unrelated to handling disappointment.
Hence, Option 2: keep a stiff upper lip -> This idiom perfectly captures the act of staying strong and maintaining composure after a defeat, encouraging oneself to be resilient and not let disappointment show, which aligns with trying again next time -> correct