blow one's own horn
blow one's own horn or toot one's own horn {v. phr.}, {slang}
To praise yourself; call attention to your own skill, intelligence, or successes; boast.
People get tired of a man who is always blowing his own horn.
A person who does things well does not have to toot his own horn; his abilities will be noticed by others.
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Source: A Dictionary of American Idioms