Your mind must be active and your energy focused to be successful. There are many barriers to communication - perception, knowledge, emotions, interest, appearance, prejudice, and distractions. Think about how these affect communication. Perception is reality, but perception is not always true. Knowledge can be a problem if you can't take your message to the receiver's level.
People listen more when they are interested in the topic.
Professional appearance is important to promote respect for your position. Distractions can come from noise, temperature, lighting, hunger, etc. Whether the message is verbal or written, consider the question words - what, where, when, why, who, how, which, and well. The sequence of the message can be numerical, alphabetical, chronological or progressive. The form chosen depends on the topic.