I go to Shabbat Berachot parties, and when everyone make a berechah on a Hagefen, we all have in mind, names of people who need to find their marriage partners. We ask Hashem, that they not only find their zivug, but that they are from Invei Hagefen. We also have in mind, people, C’V who are with goyish partners, that they should leave them, and find jewish ones.
Also, parents, start davening for your children from when they are young, that they should find their zivug easily.