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Trickster Makes the World by Lewis Hyde is a fabulous book about global trickster gods and he has a great section on Native American folklore as well as central and south american indigenous lore. Well worth a read.

I also snagged a book on Arctic Giants, which covers a lot of cannabalistic giants of arctic. Some cool gruesome stuff in that.

I have an older edition of Aleksandr Afanas'ev's "Russian Fairy Tales," which includes Baba Yaga stories and a lot of other interesting tales. Not sure if there is a difference between mine and what I linked to (i.e. updated items, etc.)

If you snag yourself a Brewer's Dictionary of Phrase and Fable, you can find some really good items. I also tend to collect reference books, which can let you leapfrog to other books on the topic.

There's a whole genre dedicated to this. Check out LitRPG or GameLit. In my book, the main character dies in the first chapter and gets uploaded to a digital afterlife. https://www.amazon.com/dp/B071WF4414

You also might want to check out the 1907 book Memoirs of a Man's Maiden Years by Karl M. Baer under the pseudonym N. O. Body, with help from Magnus Hirschfeld.

This is a semi-autobiographical novel. Baer was either a trans man or possibly intersex, assigned female at birth and raised as a girl. He was one of the first trans people to receive gender confirmation surgery in 1906, and had a new birth certificate issued in Germany in 1907.

It's quite a bit later than the time period you want to write about, and gets into the beginnings of the modern language and concepts of being trans (Hirschfeld literally coined the term "transsexual" and established the first clinic offering modern transition-related medical care), but the early parts of his life might still give some ideas for how to portray a trans man's life in an era before there was modern language to describe it.

FWIW, Shooter is actually based on the Stephen Hunter novel Point of Impact

https://www.amazon.com/dp/B000OI0FVW/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1

I'd read this book.

http://www.amazon.com/Flight-Passage-Memoir-Rinker-Buck/dp/0786883154

The postmortalworld is one guess: https://www.amazon.com/Postmortal-Drew-Magary/dp/0143119826

I tend to think the knowledge that you have to live with your mistakes might make us more cautious.

Brain-chemistry wise I expect we'd become more and more incapable of remembering everyone we know, all the things we've done etc. over time.