Yom Tov Shel Rosh Hashana
Whenever we do a Mitzvah below we cause God to do the Mitzvah above – it’s a reaction.
It is known, the teaching of the Baal Shem Tov (on the verse, Tikui Bachodesh Shofar) that every Rosh Hashanah we must blow in an entirely renewed way the Shofar! – and as is known the teaching of the Maagid (on the statement of our sages “know all is from above”) that all that is elicited from above is due to what you do below! – hence by us renewing our Shofar (taking it to greater heights) we cause the same to be done by God.
Every Rosh Hashana a renewed vitality that vitalizes all the universes (spiritual and the physical) emanates.
The vitality that the Jewish people and the world receives on Shabbos is much higher (to the extent that even a Jewish simpleton on Shabbos lies not) and even the physical world is elevated (as is known, that the Sambatyon river doesn’t throw its rocks on Shabbos.)
When Moshiach comes, not only will we blow the Shofar in the Beis Hamikdosh on Shabbos, but because then all negative decrees (or problems) will disappear, hence everywhere.