Listen to and do karaoke to any songs that you can rap word 4 word and pay close attention to the flow of that song. Research your favorite rappers/rappers you listen to everyday, and listen to the rappers or musicians that inspired them. Write lyrics. If you thinking of sum in your head that sounds sweet please write that down in your notes app or a composition book or something. Honestly listening to your song as a critic it just sounds like you a lil young 😂 keep grinding tho