Try a raw potato in the pot , this may absorb some of the spices also add more water if there is room. Rather than adding water which will just make it thinner - add milk or cream to tone down the...
By adding in potatoes into your soup it will help tone it down!!!
Natural yoghurt will cool most things down.
A Drop of lime. A tin of tomatoes. Maybe cream if you don't care about the calories. Or stick it in a larger pot and make enough for the neighbours!
I think that one way is to add a little bit of sugar. It should bring the flavor down. Hope it works for you!