One primary ways to embellish a melody –> to slightly alter the long notes in the melody.
Reason: long notes provide more space fo ryou to lay around with
— to fill in this space is a way to show your musical creatiivity
To make a long note less boring –> bend the pitch.
Pitch bends come quite naturally on certain instruments, esp guitars where you bend the pitch by bending the string away from the fret with your LH.