Your Inherent Access to All of Existence, Including What We Call "the Afterlife:" Imagination
What we call "imagination" is not what we've been trained to think it is.
Imagination is a set of "veiled" astral senses and capacities that represent our innate capacity to experience, to one degree or another, actual, real locations in the infinite diversity of existence. There's nothing you can imagine that doesn't exist somewhere.
If you want to have an experience of the afterlife, just imagine whatever scenario, location or situation you would like to see. No matter what you see or experience, it exists; you're just usually getting a kind of low-grade, low-resolution, highly-filtered and difficult to maintain version of that through your "veiled" capacities here.
If you would like more information on this, I have a free book you can read, called "The Architecture of Potential," which is very concise at less than 70 pages. The book also provides a method of moving from point A towards point B, or "where you are" towards "what you imagine."
Please remember: I'm just some guy on the internet writing stuff. Take it or leave it, agree or not. It's all good.