Nobody starts out living for the sake of others on the worldwide level.
True Father started out building his church by living for the sake of one or two members. We too have to start with our family, our spiritual children, our tribe. True Father calls many members to live for the sake of a higher level, even a national or world level, but it's best if he has people to use who already have successfully built their own foundation. True Parents want us to successfully witness to our tribe, then on that foundation God will be delighted to call us to work on a higher level, and we'll start to really see the big picture. I know of only a few members who have success with their tribe.