If someone preaches to the choir, they talking about a subject or issue with which their audience already agrees. ('Preaching to the converted' is an alternative form.)
An reaching idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with reaching, allowing users to choose the best word for their specific context.
Diccionario de palabras similares, Sinónimos, Diccionario Idioma reaching