All the articulations you have learnt are also used by saxophone and trumpet players. The great Chicago Blues harp player Little Walter got many of his ideas by listening to sax players and horn sections. The following solo is in the style of Little walter and demonstrates how effectively a harp and guitar can imitate a horn section.
It is also important to listen carefully to the articulations used by harp players on your favorite albums and imitate the ones you like. All good players have worked on their articulation to help them express the music in a way that moves people. By studying their articulations, you will gain more control of them yourself and your own playing will become more expressive.