Sgt. Pepper
All you need is love.
I believe that where souls go after death is to a spiritual world. We cannot know what that world will be like till we go there.
In my opinion, the spirit world isn't completely unknown, and I say this based on my lifetime of experience.
So yes, the destiny of the soul after death remains unclear, but I don't see that as a reason to believe that the soul comes back to this world to live again. I cannot see any merciful and just God sending anyone back to earth to do this all over again. Once is more than enough.
I believe that we can know about the destiny of souls. I'm speaking of the knowledge and experience of genuine spirit mediums and also near-death experiences. Based on what I understand as one, our afterlife can be determined by how we react to our death as well as how we lived our physical life.
For example, if a person is benevolent in this life and accepts their death, then they will most likely experience a positive afterlife. They are likely to cross over because there are no unresolved issues that would hinder them from doing so. However, if a person is an obnoxious jerk and/or abusive to others in this life, they will continue to be this way after death. As a result, they are likely to have a very unpleasant afterlife, which could ultimately result in them not being able to cross over or refusing to do so. In regards to reincarnation, I've already expressed my opinion on it in other threads, such as this one.
Near-Death Experiences Research Has Doctor Convinced of Afterlife
Hospice nurse shares the one thing 'almost everyone' sees before they die
Why do you think that going to a spiritual world after death is full of difficulties, simply because the nature of the spiritual world is unknown to us?
Going to the spirit realm after death, in my opinion, is difficult due to what people believe and/or are taught about life after death. I am particularly referring to Christians and what they believe and/or are taught from the Bible. It is not only very sad to me, but also very frustrating for me at times.