Actually, I would not normally write "The End." If there is an abrupt change of POV (often the case), that can be signaled by other means.
The concept of an Epilogue is that the story is over. Whatever happens in the Epilogue, and it should be short, typically represents either an outside view, or a brief comment by one of the characters. Not always. However, a long Epilogue, which is actually a continuation of the story, is rare.
Remember the movie "American Grafitti"? After the story finished, just before the closing credits, there was a brief display of the fate of its major characters, several years later. (X married Y, Z moved to Timbuktu, W joined the Army; something like that). That was an Epilogue.
Anothor kind of Epilogue is a bookend, matching the other bookend in a Prologue. Somebody (who may or may not be a character in the story) introduces the tale in the Prologue, then tells you the subsequent reaction, after it's all over, in the Epilogue.
There are other ways of doing it. But from your description, it doesn't sound like your Epilogue is really an Epilogue. If it is non-story material (such as an explanation of the cult practices of groups involved in the story) then it should be an Appendix, or something like that.