Answer: The Creator is the highest nature. Nature has many levels, and the uppermost level includes everything that we are able to discover with the help of all the sciences and the science of Kabbalah, which reveals the mechanism of force of bestowal. All this together is called the Creator.
Indeed, all this is under the control of the properties of Bina, the force of general bestowal, which is called Elokim, the Creator. What else exists besides this is not known to us. The wisdom of Kabbalah gives a clear answer to this, as in any science: we do not know what is above the force of bestowal and are not able to reveal this.
Maybe it is only a temporary restriction. Generations are advancing one after the other, revealing and correcting nature. Perhaps, after we correct the entire reality and reach the end of correction of all generations, new opportunities will be open to us.
But for the time being, we do not have the slightest contact with what is above the quality of bestowal. Perhaps, nature exists there in different ways that we, due to our structure, are not able to understand and feel. When we reach the end of correction, then we can talk about what is next. Kabbalists hint at this slightly in their books, but we still cannot understand them.
From the 4th part of the Daily Kabbalah Lesson 12/12/12, Writings of Baal HaSulam