Well put! I would add that probably nobody achieves this consistently, it's a lifetime practice. So coping strategies like I proposed her can still be useful in the chaos of daily life.
Maybe it's clearer in the form of a question: how are you completely sure you are NOT enlightened if you don't know what it is to be enlightened?
Someone kicks you in the shin, it causes pain. If it triggers a whole internal loop of fear and worry and anger and revenge and trauma and suffering, then you've hit upon your ego which you're unable to let go of. If your internal experience isn't sticky, then before you know it, the pain has dissipated and you're on to whatever the next present moment brings.
That internal loop is what there is to "fix".
Brilliant!
And this is why there is nothing to fix, because it doesn't change anything external. If it doesn't change anything external, if it's only an internal loop, it's the same as the ascetic attitude that Nietzsche describes. You can beat yourself until you're in line with your expectations for your ego, or you change your whole relationship with yourself, more accepting of your flaws and more trusting that you are able to overcome this internal loop eventually, but not today.