Simchah Is a Segulah for Parnassah
ParnassahSimcha
Rav Menachem Mendel taught on the words "And you shall be only happy" (Devarim 16:15) that the final letters of the words of this verse spell a holy Divine Name connected with the angel of livelihood. This hints that simchah, joy, is a segulah for parnassah.
Source: Toldos Noach, Likkutim 35:1, cited in Yalkut Menachem p. 232