“Great,” you say. “I agree with all that!”
Cool.
“Now, how can one figure out what #books are truly worth #reading, what is the very best?”
I don't have the perfect answer to that. But it seems to me that the best way to separate the wheat from the chaff and to eliminate all biases is to aggregate qualified opinions across time and space. ie, see what lots of experts in different places have considered the best books in different languages, over the years, and find common patterns there.
The best approximation I have found of that is
https://thegreatestbooks.org/