This interview Alex did with Dr. Tom Zinser was a game changer for me. In reviewing his books and re-listening at least 4 or 5 times to this interview, I have experienced an increase in clarity as to what may be the greater picture of reality.
I then came upon this book -
The Multidimensional Human: Practices for Psychic Development and Astral Projection by Kurt Leland has been helpful in seeing a potential overall reality structure of which I have adopted as a provisional operational grand assumption. Leland's primary sources are Seth (via Jane Roberts) and Theosophy.
I have been able to map the structure that I seemed to pull forth from what Dr. Zinser has shared and fit it right in with that which Leland suggests and this has increased my confidence I am on the right track.
Leland recommends that exploration of "extended reality" (as Alex likes to call it) be done as "a spiritual practice" and I have taken that recommendation seriously.
For those who like videos, here's a presentation by Leland with regards to "the soul."