“The drive to close the gap between near-perfect and perfect is the difference between great and unstoppable.” — Tim Grover
Even after you achieve a goal, you’re not content. For you, it’s not even about the goal. It’s about the climb to see how far you can push yourself. Its about Power of Endurance.
Does this make you ungrateful? Absolutely not. You’re entirely humbled and grateful for everything in your life. Which is why you will never get complacent or lazy. This is about keep moving ahead.