i think this hair color actually looks nice on you
i've had the sam exact problem you had with your hair...i dyed it and ended up with the same color you had when i was aiming for the same plum you wanted
...i tried again and finally it worked out
what i did was bleach the hair first ...then add a purple rinse to a dark auburn hairdye with violet as a base...i ened up with brownish purplish highlights that had hints of burgundy