Word/phrase for something that succeeds in first attempt

You are a creator. You are fearless. Though you lack expertise at the moment, your work has the ability to be decent most of the time. You tinker, you fail. You keep failing and start seeing the light.

There are moments, though sometimes short lived, where you create a masterpiece and it becomes an instant hit. A wild hit, where your inner self knows it has a hit in the pocket.

This can be a photograph, a dish or an ingenious solution to a difficult problem.

How would you define such moments? Is there a phrase or a word to describe this situation?

Solution 1:

The golf metaphor "hole in one" could be appropriate.

Solution 2:

You might refer to it as a watershed moment, after which everything is changed.

watershed
3. A critical point that marks a division or a change of course; a turning point: