How can I stop my rap recordings from sounding like I’m just reading?

• Memorize your lyrics before recording – simply don’t read while rapping.
• Practice with the beat to internalize rhythm. However, be careful not to over-practice and pick up unwanted habits
• Record yourself and listen for stiffness. And fix it.
• Break up phrasing – use pauses and emphasis. Be careful not to overdo it and hurt your throat.
• Record it in Freestyle mode.

Keep practicing. Your delivery will sound more natural and confident.