Feel free to reduce the amount of juice, based on how sweet you like your smoothie. My husband uses less juice and more milk now days.
If you like the idea of frozen smoothie packs but don't have time, give SmoothieBox a try. I wrote a full review of this smoothie pack delivery service here.
Variations and Additions:
Dairy-Free Version: Use plain almond milk or oat milk and use dairy-free coconut yogurt like Daiya brand.
Use different fruit. Raspberries, strawberries, mango, pineapple, or oranges would be great additions.
Add more vegetables. Toss in a little kale, avocado, carrots, or raw sweet potato.