As written in the source
2. Sanctifying the moon is a segulah for a person to find his match. And a sign for the matter: levanah (the moon): betulah nisset la-yom ha-revi'i ("a virgin is married on the fourth day"), the initial letters of which are the letters of levanah.
View original Hebrew
ב. קִדּוּשׁ לְבָנָה – סְגֻלָּה שֶׁיִּמְצָא אָדָם אֶת זִוּוּגוֹ. וְסִימָן לַדָּבָר: "לְבָנָה" – בְּ'תוּלָה נִ'שֵּׂאת לַ'יּוֹם הָ'רְבִיעִי.
A segula is not a promise of a result. It is brought here as written in the source, for study and prayer.