I'm trying to find a mate to marry her here in the galut. It is very hard to find in my community girls who want to leave their family and make Aliya. What can I say to them in order that they can meditate the subject?

On a practical level I think the best will be to find a girl in Israel, there are lots of single girls out there that are looking for an Anglo boy who wants to live is Israel. If that is not an option for you and you truly can't find your mach out of Israel, leave this detail aside and discuss it only later when the relationship is much stronger and these kinds of pre-conditions are less stressful or scary.