I know of a pretty good one if you can read German.
Fingerprints of the gods, by Graham Hancock
Mein Kampf, in the original German
A great authentic ancient book that just keeps on speaking to me through the years is the Tao Te Ching. Read sections of it daily and ponder what it might mean. My understanding of what this book is trying to convey has deepened with time. I like the old translations by Gia-Fu Feng and Jane English that are more than 25 years old as they feel more authentic. But I would get various translations and see what speaks to you.
Other books for your consideration:
The Song of Ribhu I Am That by Sri Nisargadatta Maharaj Ashtavakra Gita - (I enjoy "The Heart of Awareness" by Thomas Byron) Excelscia, The Home of the Gods by Arion - totally out of print and hard to find, but a great book.
Those are my first picks for inspiration.
Here is one for you.
Marcus Vitruvius Pollio: de Architectura http://www.mlahanas.de/Greeks/PDF/Vitruvius.pdf
A treatise originally written in Latin and Greek on architecture, written by Marcus Vitruvius Pollio in the first century BC and dedicated to his patron the emperor Caesar Augustus.
Thomas a Kempis, "The Imitation of Christ."
Read the 48 Laws of Power. Real power is practical, not mystical.
Morals & Dogma by Albert Pike in before kike, and misquoted lucifer references.... Tomb of Philisophy and Religon studies.
Cliche but "The Art of War".
The bible
The books of Sirach and Wisdom only appear in the Catholic bible, it's basically a bunch of stuff old people would tell you
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