When expressing one's viewpoint or opinion, there are various ways to convey this concept. Instead of using the phrase "says one's piece," one can use alternative synonyms such as "speaks one's mind," "shares their perspective," "voicing one's thoughts," "expressing one's point of view," "making one's case," "asserting one's viewpoint," or "offering one's opinion." These synonyms provide alternative ways to express oneself in a conversation or debate. It is crucial to use synonyms to expand one's vocabulary and avoid repetition while effectively communicating one's thoughts and opinions.