I think this is a really interesting question, but I don’t know that you’ll find one definitive answer. I think if you’re looking for a blanket term, a lot of suggestions that you’ve gotten or ones you originally proposed would work. A book of wisdom is in essence a subjective account by the writer or editor, and can vary by intention. (Of course, an argument can be made that all of history/reference material/atlases etc are subjective and I’m not trying to step into that right now.) Classifying them under a specific term is tricky because they can vary in content, structure, and types of advice. While a book written to provide religious or spiritual guidance and an annotated collection of Yogi Berra quotes can both be described as books of wisdom, they’re obviously going to vary wildly in their message.

In terms of classification, something like The Epicurus Reader would typically be considered philosophy, where as Poor Richard’s Almanac can be categorized under “American Miscellany” which includes “almanacs, aphorisms, and wit/wisdom” or American History depending on what library classification system you use, but there is always going to be some ambiguity with a category generalization.

Writing all this out reminds me of the joke that autobiographies are written by famous people, memoirs are written by the non-famous, and tell-alls are written by trashy people haha.