Our Sages teach, ‘the Jewish people will only be redeemed through tzedaka.’
The Alter Rebbe explains: Nowadays, at the end of the exile, our most important mitzvah is to give tzedaka. The reason being that the level of Malchut, referred to as ‘Sukkat David’ (the Shechinah (the Divine Presence) that vests itself in the lower Worlds) has fallen to the lowest level. It is our job to elevate it by way of acts of tzedaka, giving to someone who is in a lower state than you and doesn’t have anything of his own.