Add more green chilies or use spicier varieties for a hotter korma. Alternatively, add red chili powder for extra spiciness. Start with 1/2 to 1 teaspoon and adjust to your preferred level of heat. Make sure to taste the korma and adjust for your preferred level of spiciness. Remember, heat tolerance varies from person to person, so it's crucial to find the right balance for your taste. In addition, consider serving raita or mango lassi with the korma to balance out its spiciness.