There are eleven dimensions. After the earth you will move into the next higher dimension for a short time and then your personality will go to it's adjudication where it is essentially "judged" by your soul. The soul may choose to fuse with your personality forever or it may not depending on how selfish your personality is. Most likely, if you were unable to see other humans, complete strangers, as equal to yourself then your personality will be deemed too selfish for the universe. The soul will simply abandon it and try again and that personality will cease to exist.
Sometimes souls are too eager to ascend and they fuse with immature selfish personalities. This is a problem because the bond normally cannot be broken and a soul with a selfish personality absolutely will not be allowed to ascend into the higher dimensions and eventually return to heaven. So, these soul/beings recycle back into this dimension in the hopes of finding a personality combination that is unselfish to join with and essentially overwrite the selfish personality elements.
Ghosts are higher dimensional beings who are not allowed to ascend nor are they allowed to return to this dimension, they are essentially stuck. Ol' Lucifer's little rebellion caused the access to the higher dimensions to be shut off completely for a while. Now Christ controls the access and work is being done to help the "ghosts" get unstuck.