Very similar to the concept of the dip, explained in the book The Dip by Seth Godin

I asked Google to briefly summarize the concept:

> The Dip: It's a term Godin uses to describe the unavoidable and challenging period that occurs after the initial excitement of starting a new project, skill, or career, and before achieving success or mastery. This is the time when things get difficult, frustrating, and many people are tempted to quit

> Embracing the Dip: Instead of being discouraged by The Dip, Godin suggests that dips can be opportunities. They serve as a natural filter, separating those with the determination to persevere from those who are not truly committed. By pushing through the Dip, you can emerge stronger and potentially achieve greater rewards