The order you add your ingredients to the blender can make a difference in how easily your smoothie will blend. Ideally, you want liquid and softer ingredients nearest the blade to prevent the frozen ingredients from getting stuck under the blade.
For some added healthy fats, you can either add some avocado, or nut butter. It adds some creaminess too.
If storing leftovers of the smoothie, give it a good shake or a little blend again before serving.