When you're trying to find the perfect way to express that a certain idea or sentiment really resounded with you, there are a number of synonyms for "struck a chord" that you can choose from. Any number of phrases can work depending on the context, tone, and complexity of the idea being discussed, including "hit home," "resonated strongly," "rang true," "hit close to home," "had an impact," or "made a connection." Depending on the tone and voice of your writing, any of these alternatives can convey the idea of a topic being particularly meaningful or striking to the speaker or writer.