All the meditations to unify upper and lower, Zeir Anpin and Malchut are for the purpose to connect the souls of all Israelites to the Torah. Taking זאת to Zeir Anpin.
The six days of creation on the highest level are counted as 600000. The work in Malchut is to repair the broken vessel to be able to hold the light constantly without losing it to the negative side.
זאת is the story of the global correction. The first letter ז is equal to 7 to tell us the connection to the 7 Sefirot and the final destination which is a time that every day will be like Shabbat.
The את is the first and the last element in the set of spiritual tools known as the Hebrew letters. את represents the first creation by God before any matter. It said in Genesis 1:1
“בְּרֵאשִׁית, בָּרָא אֱלֹהִים, אֵת הַשָּׁמַיִם, וְאֵת הָאָרֶץ”
“In the beginning God created אֵת heaven and אֵת earth”
The next process of 7 days is represented by the letter ז, which is a combination of the letter Vav (=6) and a crown on top.
When the Torah is raised before the Shabbat reading, the congregation recites from Deuteronomy 4:44 “וְזֹאת, הַתּוֹרָה, אֲשֶׁר-שָׂם מֹשֶׁה, לִפְנֵי בְּנֵי יִשְׂרָאֵל.”
“And וְזֹאת is the Torah which Moses set before the children of Israel”
When we elevate ְזֹאת with the Torah by our connection we create a unification that completes the circle of light and vessel and puts our soul as part of the Torah.
We add the letter Vav that represents Zeir Anpin to זֹאת to create continuation. The letter Vav is the Hebrew letter that connects two parts. וְזֹאת has the same numerical value of twice light אור for running and returning light.