Flag it and select ‘Other’ and state one of:
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Just move it to #staff?
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Another solution is to convert to a whisper. Unfortunately that’s not possible out of the box and would require a plugin.
… Like this one:
https://github.com/paviliondev/discourse-toggle-whisper
Caveat: not used this in a while but it’s a starting point, you will need to test it
Imho this should be a core feature as one can post intending to whisper but use a normal post and theres no way normally to toggle
Credit: @fzngagan