Congratulations on reaching The End—but, it's hard to stop moving when you've got
white line fever isn't it?—you've been on a long journey, that, in a way, you don't want to finish. It's hard to be stopped and stationary!
Epilogues are tempting sprites. When I finished writing my already too long first novel, which weighed in at 139,000 words, I fretted for several weeks before pitching back in with a 40,000 word Afterword!

I could have called it an Epilogue or a Postscript, but I felt compelled to explain what became of all of the victims of the serial killer of my detective tale, as there were so many mystifying loose ends. My reader appreciated the Afterword, but I still felt a bit like a failed comedian who had to explain how the joke worked.
Some epilogues occupy several pages, but I've read others that were a terse couple of paragraphs, with the author behaving like a dispassionate god as they summarised their protagonist's fate after the story ended.
If you're writing a story that's part of a series, rather than a standalone novel, then the epilogue can be a springboard into the next adventure.