Seeking out more contrast to get a little more pop with the tie you get something like this, )a wool solid charcoal grey tie):
True, I had swapped out the square for one with a little more color, but even without the colored square the darker tie does well alone.
Alternagtively here is dark grey (laced with brown and blue) with a splash of blue (the suit also has a splash of blue in there as well) tie.