I think I avoided the problem of having so much backstory by making the key content integral to the plot. i.e. my characters are going to find out that the official events of 500+ years ago, as written in history books, are modified from the true version of events. My characters will then be desperately working to find out why, and what the true version of events are. This interweaves with Gods, wars, the rise and fall of various kingdoms. That takes place over 3 books, avoiding any sort of massive info dump. I think .

But as a lot of people said, with information regarding my fantasy world in general, things come as and when they are relevant. Sprinkled evenly as the prose advances.

But then again, I am just a hobby writer (nothing remotely near publishing) so take my thoughts with a grain of salt .