Something I've mentioned before, but usually as part of a reply to something else: I strongly believe that the work would benefit from being officially divided into different books. Chapter 63 was incredibly cathartic to read, partly because it was a very intense chapter that resolved a lot of stuff, but partly because at the time, we knew a hiatus was coming and that it was the End™ of a particular section. That, in combination with the fact it touched upon every single plot thread, made it feel more potent. And the PDF version, at that time, was a little over 1000 pages, which is about right for a Harry Potter book.

It's also a daunting to get new people to read something when there's a bajillion chapters. I don't know if you're planning for two parts or three, but presumably there will be at least 120 chapters when this is done, if not 180+. I had better luck getting new people to read it when I specifically said "book 1 just finished, I can give you the PDF of that," and I think that's in part because "one book" is a friendlier way of measuring length than some large number of pages.

Fanfiction.net might have specific rules, or you might want to just keep things consistent there. But I'd like it if when the next section is finished, you do a PDF that gets treated as its own separate book.

(I also feel like Part I could benefit from being divided into subsections. For instance, the first 20ish chapters end with Harry sending the letter to his parents, which felt like a good stopping point, as did the Christmas break which gives us a pause before the events leading to Azkaban kick into overdrive. I'm less concerned about that, but I do feel like having discrete chunks to show to people makes it less daunting to begin reading).