I'll give a different perspective on this.

As long as you categorize things as good/bad, favorable/unfavorable, positive/negative, you will always experience ups and downs. Until all events are viewed with equanimity, the polarities will always exist. Until the desire to prevent certain experiences exists, mental fluctuations will always exist.

The moment you decide to accept all events as just events, the moment you stop associating labels like positive/negative, the moment you let things be, that is the moment, you are free.

Ironically, that also makes you an expert at everything, yet you don't care. How? Because your mind is not biased towards certain events transpiring, you view the reality of things, not the reality filtered through your emotional and personal biases.

A concrete example: Let's say you have decided that you never want to be angry. Over time, this becomes a part of your identity. What does this mean? It means that even if the situation calls for it, you will not be able to express anger. By the very fact that you view yourself in a certain way, you preclude the possibility that you could be any other way. This is what is meant by annihilation of the ego. In that state, you are everything (because you do not associate yourself with any identity, you can assume whatever identity you want at that moment) and yet you are nothing (because you don't have an identity).