To stimulate your cat's appetite, try the following methods:
Adjust your cat's daily diet: Provide a variety of foods, including meat, vegetables, and fruits, to stimulate their appetite. Also, avoid feeding your cat expired or spoiled food.
Increase exercise: Insufficient exercise can lead to loss of appetite in cats. Providing them with toys and games can increase their activity levels and stimulate their appetite.
Keep the environment clean: Cats are very sensitive to their environment, and keeping it clean can increase their appetite. Clean your cat's living area regularly, and avoid using harmful cleaning agents.

Try changing the brand or flavor of your cat food: Sometimes cats may not be interested in a certain type of cat food. You can try changing the brand or flavor, or add some of your cat's favorite foods to the cat food.
Increase the aroma of food: Heating cat food to lukewarm or warm temperature can release more aroma, thereby attracting the cat's appetite.
Regular feeding: Establishing fixed feeding times and amounts can help cats develop regular eating habits, thereby promoting their appetite.
Give them high-quality canned cat food: High-quality canned cat food usually has a higher meat content and more nutrients, which can attract a cat's appetite.