Lv80, Lv88-89 zone: Sharlayan, Upper Labyrinthos

Lv80-82 zone: Thavnair, Tower of Zot

Lv83-84 zone: The Eblan Rime (or sub for a zone like Corvos)

Lv85-86 zone: Outer Garlemald, Garlemald Subway

Lv87-88 zone: Inner Garlemald, Tower of Babil, Anima as trial

Lv89-90 Zone: Mare Lamentorum, Zodiark (or make the moon two zones)

Patch 6.1: Loporrits story

Patch 6.3: Vanaspati, a Blasphemy as a trial boss

Patch 6.5: start to see the final days spreading even more

Lv90-100 expansion should introduce a unique feature where overworld mobs start slowly getting replaced by Final Days variants imo. They have the tech.

Lv90, 98-99 zone: Lower Labyrinthos, The Aitiascope, Hydaelyn trial

Lv90-91 zone: some region of the world infested with the Final Days, new city there too. Maybe Corvos if it wasn't in lv80-90

Lv92-93 zone: Elpis, Hermes as trial

Lv94-95 zone: not sure. maybe another region of the world like Inner Hingashi now that even they are affected and can no longer be closed to outsiders, and new city there.

Lv96-97 zone: not sure. Maybe Inner Moon as people start evacuating.

Lv99-100 zone: Ultima Thule, Dead Ends, Final Days. Or split Ultima Thule into two zones.

Sharlayan may be weird being split into half like this, so maybe only open it at Lv90 and make something like Corvos the substitute at Lv80. 5.5 story also needs to be adjusted.

I think doing it like will make the story feel far less rushed.