During Rosh HaShanah there is a new revelation of the distance separating us from the Creator. Any event begins by revealing a new property that separates us from the Creator. And during the Rosh HaShanah holiday, we reach adhesion with the Creator in this property.
Therefore, Rosh HaShanah is the head of our entire development, and all the properties that are manifested in this holiday, later are revealed even more and more fully during all other holidays and special dates.
From the Daily Kabbalah Lesson 9/15/23, “Rosh Hashana“