Getting the readers onboard with minimal confusion is always the trick here. As you’re doing character A/B/C/D treatment, I’d still recommend making it as chronological in order as possible, with dates and some transition for wherever it’s not. Star Trek usually did it with “stardate...” that became meaningless, and outside of a main character coming/going, a lot of those episodes you couldn’t be pressed on what the actual in-universe order *is*. My potter fanfic has the POV thing, so it’s doing slight shifts as I cover the Hogwarts crowd in one chapter, and Harry/Ron/Hermione on the next; simply because it offers better focus.