Three things counteract spice: Fat, sugar, and acid. If your chili is too spicy, stir in a bit of dairy (sour cream, Greek yogurt, shredded cheese, or even a splash of milk or heavy cream), a splash of something sweet (like molasses, brown sugar, or honey), or something acidic (like more tomatoes, lemon juice, or apple cider vinegar). Add extra ingredients in small amounts, and taste as you go until it feels just right.