… assists, coaches, supports and facilitates your regulars to welcome new people.
If Max brings Bob to church, you don’t just want Bob to get support as he joins. You also want to support Max and help him support Bob as he joins. If you only support Bob, Max learns that the “church” will do the welcoming. And next time he meets a new person, he’ll just assume that the “church” is looking after them. Not much scope for growth there.
If you support Max as he helps Bob to join church, not only will Bob join but you’ll also be teaching Max that welcoming is something that all Christians do. Some will do it better than others, but he’ll see that it’s worthwhile, hard, and he’ll be more keen to support others as they bring along new people too.