It also raises the question of what defines “original” anyway? Is an Emo song with the same/similar chord progression and same scales used in a guitar solo really that “original” to a more traditional Rock track released a decade or two earlier?
With song writing you really have to write what you feel drawn to write. That way it will be the best song you could ever put out for the world to hear. And the more that is refined the more honest it will be and eventually how “original” it will sound.
Without sounding too poetic, in summary write from the heart. If it comes from that place where you are being true to yourself then it can’t possibly come from anywhere else in this world. And that is purely original.