I think about death alot.
Discussion
It's part of our nature, as humans, to think about death.
So have I, perhaps more than one should in this life time. Studied the subject for over 4 decades and learned that every 'ism', culture, or religion's mandate to exist is to help us transcend that moment.
Having read countless books and manuscripts there were only a handful that challenged my held assumptions and fears. Some for the better, others shook my soul undoing me, but through it all I found myself back where I started.
I have my top 5 books if interested, but recommend this book as a beginning...
I want to add "The Apocalypse of Yajnavalkya" to your list, if it isn't already on it.
I've read many and varied books on spiritual subjects addressing the issue of death and it is the first one that for me, really made it clear this notion of a soul.
I'm of the opinion, that actually, a soul is something that you earn, when you start to wake up, and takes a long process of attunement to its ways, before you can step out of your body and into it, something the Kabalah calls "merkaba". Or was that the Book of Enoch?