"All of you" is a common phrase used to address a group of people, but sometimes it can sound repetitive or too casual. Thankfully, there are several synonyms that can be used to convey the same message with a different tone. For instance, the phrase "everyone present" can be used in a formal setting, while "you all" or "y'all" are more informal options. "Each and every one of you" is a more specific and personal alternative, while "the whole group" or "the entire party" can be used to emphasize the collective nature of the group. Ultimately, the synonym you choose will depend on the context and tone of the situation.