You're preaching to the choir — I already agree with you.
preach to the choir
idiomTo speak as if to convince a person or group of something they already believe.
He spent ten minutes explaining why recycling matters, but he was preaching to the choir at that green conference.
The politician's passionate speech about tax reform fell flat, for she was preaching to the choir in a room full of economists who had proposed the very same policy years ago.
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Nikon choir
A large group of photographers simultaneously capturing images of a celebrity, producing numerous photographic flashes along with an accompanying din of clicking camera shutters.
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preach in the desert
To speak to or persuade a nearly nonexistent audience, or to an audience not listening.
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preach to deaf ears
To attempt to persuade a party that does not wish to listen or cannot be altered in its conviction.
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preach water and drink wine
To act hypocritically; to fail to practice what one preaches.