The Jewish people make the Shabbos:

G-d commands us in Scripture to remember the Shabbos to sanctify it. Now, it is not understood as to why we need to sanctify the Shabbos as unlike the holidays which require the courts to sanctify the new month prior to the holiday in order to determine the holiday, Shabbos is already sanctified on its own and does not require intervention of man. Hence, what is the meaning of the command to sanctify it? The explanation is as follows: Shabbos represents the spiritual level of supernal wisdom which is higher than speech and action. Now, supernal wisdom receives its divine energy from the level of supernal pleasure. This supernal pleasure is not drawn down to the supernal wisdom on Shabbos on its own but rather only with the help of the Jewish people. When the Jewish people perform Mitzvah’s throughout the week using the objects of the world, they elevate many divine sparks back to heaven. This elevation elicits a great pleasure above which draws down the level of supernal pleasure into supernal wisdom. Now, when do the sparks that were refined throughout the week become elevated on high? So, there are a few steps of elevation necessary for them to go through until they finally reach their destination above. First they become elevated during the prayers of the weekdays. These weekdays prayers themselves become elevated through the prayers of Shabbos, which is elevated by Shabbos itself. It is hence found that the actual elevation of the divine sparks to heaven to elicit the supernal pleasure occurs on Shabbos, although is based on the work done during the week. Accordingly, it is the Jewish people’s work of Torah and Mitzvah’s during the week which make the Shabbos retain its holiness. Based on this, we can understand why Scripture instructs us to work six days a week, as we need to work with the items of the world and use them to perform Mitzvah’s and serve Hashem in order so there will be a revelation of pleasure within the supernal wisdom on Shabbos.

Torah Or p. 69b-70b