The question's focus comes mostly from a Baal Teshuva's point of view. When it comes to 'parting' with family and friends - indefinitely - for the better, what resources do a great job giving encouragement to this tough task? A few areas to address would be:
Longing for non-observant family/friends to become observant
Finding peace in memories of past life
Embracing change despite how foreign or the distance it creates from loved ones