I have a theory about this book.. The Book of Enoch seems parallel to Daniel which makes me think it needs to be places between 170-164 BCE.
Why was it not accepted and Daniel was? Daniel threw the Maccabees a bone... saying ' a little help'... Enoch didn't.
Also Enoch was invented out of the blue... Daniel was based on a Syrian magician.
When the Hamoneans (Maccabees) gained control for 100 years they edited every biblical text.. Daniel barley slid through as part of the writing. But Enoch lost out. However a bone was thrown to this test in what was added in Genesis 5. And that ALL that was mentioned of him.
The only other places in the bible canon that mention Enoch is Jude and Hebrews which are late texts... Hebrews author was on drugs...lol