Lost the Portal to Dalaran over Karazhan

Greetings. Playing a level 20 Alliance toon, and cannot fly.

Was given the quest “Calling of the Council” and it requires you to step through a portal that takes you to Dalaran over Karazhan, but I decided not to step through that portal because I wanted to clean up some other quests first.

Well, the portal is gone now and I can find no other way to get to Dalaran over Karazhan.

I tried talking to Archivist Elysiana in the Violet Citadel, and she offered to retell me the story of Magni Bronzebeard, etc, which I read might restart the questline, but clicking on her offer does nothing.

I braved Deadwind Pass and could see Dalaran in the sky, but because I’m a level 20 I could not fly to it.

Any other ideas on how to reach Dalaran over Karazhan? … for a low-level alt.

I enjoy exploring the game by foot, and by mount, but this hiccup has me stumped.

[edit: I abandoned the quest and that freed up Archivist Elysiana to retell me the story, but no portal appeared. Maybe I was mistaken. Maybe Dalaran over Karazhan can only be reached by flight.]

Thanks!