This is Julius. You are asking about people who Ascend to the ‘Heaven Existence’ who are not Spiritually elevated and those who are.
Although my time here is relatively short it seems that because of my State of Enlightenment I am able to Travel far into the Spiritual Realms quite easily and have access to much Knowledge. If someone dies without having access to the Light and Sound they don’t have that Freedom. Sometimes they stay absorbed with the family they have left behind or an aspect of that life, for a long time.
Imagine that, you have Freedom in the life you are living now, you have Transcended the physical/emotions and your mind already and moved to the Higher Dimensions already while still in a physical body.
If you are not Initiated or Awakened in some Spiritual way you need to do that when you pass over, but there are Limits to how far you can go.