Well...
Between Worlds has an ensemble cast and a few of them take turns at being the MC. Would just be following different characters at different times.
If I get that far, Jack Diamond (Diamond in the Rough, Blood Diamond) will be absent for most of fourth book in his series (first book is an origin story, second book introduces vampires, third book brings him to Boston, fourth book has him poisoned and near death until the end), so will be exploring that through the eyes of two different characters if I get that far.
Strange Awakening is Kelly's story and would not work from another character's POV. Only other character who could "tell" it would be the main villain of the first arc.
Going over to the story I have on Royal Road, True Blue, I would probably have to follow either Dina (which would be ... basically Jack Diamond without the magic items and on estrogen) or Tara (which would be a very different story and might be fun - would probably look a lot like the old Marvels miniseries from, well, Marvel Comics in the 90s).
The story on HoneyFeed would be very different as well - if I ever continue into the second book, it will build to an ensemble series, but it is Nick's story with occasional digressions to see his father's POV now, and I'm not sure it would work if I handled it differently (unless I just wrote it from his System's POV, which could be amusing but would be a lot shorter).