In most translations, YAH is seen as Yahweh or LORD. Whenever you see LORD in scripture, this is the name of God that describes him as the "I am". In observing God as the I AM, we are seeing the side of God that has always been, will always be. There is no beginning, nor any end to his existence. This is something our finite minds have a hard time with because everything around us has a beginning and will have an end at some point. Even when we think there might have been an 'emptiness' somewhere in times past, there never was because God was, is, and will always be!
If we think of God as the I AM in our lives, we are really acknowledging that he created us, keeps us going throughout this lifetime, and has prepared an even greater life into all of eternity with him. He is indeed the father to orphans and the one who cares for the widows. He is also the one who cares for all that is in existence because he is the creator and sustainer of all that is. The fact he gives 'special attention' to the orphan or widow is just a recognition of the special protection he gives to those who are without 'protection' of their own in this world - those who have no 'covering' over their lives.
In OT times, the widow had no one to care for her daily needs, nor did the orphan. The usual 'duties' of the widow as the one to care for the household while her husband went out to tend the fields or flock did not provide a living for her or the children left behind. She was without a 'covering' over her household. What does sin create in our lives? A place where we have no 'protective covering'. We are outside of the place God prepared for his children. When we say 'yes' to Jesus, we find ourselves being brought under God's protective covering - YAHWEH - the one who was, is, and always will be is making a place for us to dwell in safety and security.
We prepare the way for his presence through worship. We abide in his presence through worship. We enjoy the protection of his presence through obedience. Worship might just create an atmosphere that opens our heart to be led into obedience when we are least likely to be obedient. So, worship on - enjoy the presence of the I AM - and step forward into choices that reflect a life lived under the protection of the one who always WAS, always IS, and will always BE. The I AM (LORD) is waiting. Just sayin!