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He became complacent after winning the award and stopped practicing.

satisfied with oneself or one's achievements, often to the point of being unaware of potential dangers or deficiencies
She felt complacent about her easy success.
Do not be complacent with your current skills.
He was complacent and ignored the warning signs.
complacent in victory
complacent about the future
complacent attitude
smug
unconcerned
self-assured