Add more unsalted water or stock
Add more vegetables, legumes, or meat
Add a peeled potato and simmer, then remove it
Add coconut milk, cream, yogurt, or cashew paste
Add more tomatoes or tomato puree
Add a little sugar, honey, or jaggery
Add more spices and herbs without salt
Add lemon or lime juice
Serve with plain rice, bread, or naan
Dilute the curry and adjust seasoning gradually