The phrase "this one" is often used to refer to a specific person, thing, or idea in a conversation. However, it can become repetitive and redundant if used frequently. Therefore, it's important to have an arsenal of synonyms that can be used instead of "this one". Some alternatives include "that particular object/person/idea", "the one in question", "the one we're discussing", "the specified item", or "the aforementioned individual". Using different phrases to refer to the same thing can add variety to your conversation and make it more engaging.