The Law of Correspondence is directly related to the foundational Law of Divine Oneness. The key idea here is that patterns repeat throughout the universe, and that prominent patterns can also be found repeating on a very small scale.
For example, think of the popular example of the spiral pattern that reappears in a huge number of places in the galaxy. Look for patterns in your own life and in your thinking, and notice how they repeat elsewhere in the world. As you do so, consider the kinds of pattern changes you might be able to make, and how those will create change on a large scale.