If you want to inform someone about something important, you might find yourself using the phrase "be advised of." However, there are plenty of other synonyms you can use instead. For instance, you could say "take note," "heed," or "pay attention to." Alternatively, you could use phrases like "be aware of," "keep in mind," or "consider." Depending on the situation, you might also use more forceful language like "take heed," "listen up," or "take seriously." The key is to choose language that communicates the seriousness or urgency of the message you want to convey.