When following a Ketogenic Diet you will be consuming the majority of your calories from fat. 1 gram of fat has more than double the caloric value of 1 gram of carb or protein. Fat is not only calorically dense, but also tends to be low in volume. For example, 2 tablespoons of nut butter is around 200 calories, which is equal to about 6 cups of broccoli. If you are struggling to stay full on Keto try eating more fibrous vegetables that are high in volume.
Protein has the most satiating effect of all the macronutrients. Make sure you are getting adequate protein for your genetic makeup and activity level.
You can also increase you water intake. Lots of people confused thirst for hunger. Drinking water will ensure you are hydrated and can help you feel fuller for longer.
Lastly, supplementing with ketones and MCTs will boost ketone levels in your blood which has been shown to suppress appetite.