Any attempt against nihilism is a cope. But you have multiple methods of coping.
If we agree that Sin originates as a negatory will of annihilation/towards absolute non-being of god and that Thelema is a positive creative will of god, the following becomes clear.
Ennui Heidegger states is what occurs when the fullness of being becomes clear and its profound emptiness becomes apparent.
At the heart of the individual there is a profound sense of incompletion, of lack, what then is this state of lack; this all pervading nature which is not even of the emotions but pervades them, appears when emotions fade and the center of focus is made the total.
It is the sin at the heart of man, the negatory will of God. A profound gap in the being of an individual. The nature of this gap reflects in the death drive, melancholy is the taste of it, it is the void below, the interior hollow which is truly empty and contains nothing. This is the mirror of Sunyata which the common man tastes.
This negatory void is the contradiction at the heart of the physical being, the flesh of ones perception, this is why the ego seeks the other for affirmation, why it seeks to satisfy itself with things, itself or even God.
This profound negatory void in man, this sin-nature, hamartia if left empty leads to annihilation of the self, so man must attempt to fill it. This is the root of inauthenticity but also the chance of divine actualization, theosis. When you attempt to fill the Hamartia at the heart of man with others, your own being becomes subjugated and it is like an illusion, a imperfect image changing on a lake, it temporarily creates an image which is distorted by movement, as the other is constantly in flux, the hamartia nature returns and the image casted in the lake dispelled.
If you try to project your own will into it, that is the casting of a illusion upon the surface of the moving lake, if you try to place others or ideas or drives, all of them fail due to the dynamism of the Void in the heart of man.
How then can this void be filled? There are 4 primary methods used by men to gain relief and fulfill this void.
One can attempt to change the very structure of their being in order to latch on to some other, some stable or unstable outside point. This can be an ideal, a virtue, a aesthetic, people even.
This reliance of the other binds man to interaction with other, whether the ideas of the other, the knowledge or the society of others. This is the birth of the city of the devil, of babalon.
Man by living the cultural life,
partaking of knowledge of other, connects his being and his void with the being of others and their conceptual frameworks. The heart of these is the same profound emptiness, this causes a multiplication of the emptiness which pervades any temporary relief.