I hear what you are saying regarding not knowing the afterlife. I don't know about death or afterlife except in the dream of knowing.
I like WW's statement, "Be willing to die". To me it works as a specific prescription to minimizing the fear of death in a situation that is out of our control and where death is possible (everywhere, really?).
I also interpret it as not recommending taking action to end life, but as a strongly worded way of saying let it go, let go of attachments to thoughts, experience, perception, viewpoints, memory, imagination, fear, etc.. As saying, let it come and let it go, be willing to let go of all we consider "life", the clinging to which seems to reduce clarity and perpetuate fear and desire.
There seems to be a sort of birth and death in each moment, perhaps a simultaneous arising and ending, always. Katie mentions dying to be reborn each moment.
The Nis said, "I am already dead." Did he let go of attachments to "life"? What is there to fear or cling to in this moment, now? Isn't death sort of the passing of the perceivable changing world? Could Self realization also entail a sort of death realization (that is, prior to the body gives up it's electricity)? What really dies outside of identity founded in attachment? Our bodies all fall down and turn to dust so it seems. Me, I don't believe my clutching to the experience of life will change when my body (and with it I imagine; the dream, perception, experience, and concsiousness) goes, or alter anything that I could possibly imagine was in control regarding that or anything else anyways. Just my interpretation though.
Do the yellow-rose petals
tremble and fall
at the rapid's roar?