I believe when you die you spirit goes through a learning curb. Depending on how you die depends on how you develop in the spirit world.
For example an unexpected death or a suicide means you have unfinished buisiness on the life you lived on earth So spirit still feels drawn to that life and is earthbound and cannot move on.
Once spirit accepts why they are in spirit world and goes through all the experiences about their earthly life and accept what lessons they learn, people grow stronger in spirit and have the gift of manifistation, or to be reborn as in reincarnation.
Also a choice to stay as they are and be that one particular soul forever guiding their loved ones and future blood connections throughout their life on earth.