Since the world is going into the Dark Ages, I would like to suggest a path of learning to sustain civilization for the small remnant.
The Written and Oral Law of Moses. [Which means mainly the two Talmuds but also includes other books that contain the basic oral law it was all written down. That midrashim of law (Sifrei Sifra etc), and midrash that are agada. The reason I bring Rav Shach's Avi Ezri is that is provides a way to understand how to learn the Oral Law in depth.]
Also Physics and metaphysics.
I hope that the basic idea is clear. I am talking about learning fast--saying the words and going on until you have finished the two Talmuds. That is Gemara with every Tosphot and Maharsha. The Yerushalmi with the two side commentaries Pnei Moshe and Karban Eda.
Plus the same with Physics and Metaphysics.
[That means Physics up until and including String Theory and Math which means mainly Algebraic Geometry and Algebraic Topology.] [Metaphysics means Plato, Aristotle, Kant, Hegel, Leonard Nelson.]
[Rav Avraham Abulafia, from the Middle Ages seems very important, but I have not had a chance to study his works thoroughly so I am hesitant to recommend what I am not that familiar with. See Moshe Idel's books of Abulafia. One aspect of Rav Abulafia that I find fascinating is his positive approach towards Jesus, and yet I have not really had the chance to go into the issue in detail. The basic idea seems similar to how you consider the Patriarchs, Moses, Aaron, Joseph, David. I.e., souls of Emanation.