Razing in Civ7 in a domination victory

So I have been going after a domination victory, but basically my enemies are just pumping out new settlers and settling in the most random and horrible locations. This ofcourse means that I have to keep destroying more and more cities and then have to either keep them or raze them. I do not have enough settlement limit to keep them (neither do I want to because the locations are awful), but if I raze them then my war support will completely ruin trying to fight my next enemies.

Is there something I can do to counter this, or is this a known problem in the game that I can't do much against?