Lost in the Harbinger quest line

I’m doing the harbinger questline to prepare for the next expac.
I was on the quest “And be one traveler, Long I stood” and I got lost so I dropped the quest thinking I could just start over. Long story short, I cannot just start over.
I need to pick the quest back up at Eredath, but I can’t figure out how to get there from Dalaran or the Telogrus Rift .

How can I get back to Eredath to Start “And be one traveler, Long I stood?”
I’m playing a troll that hasn’t done any content prior to dragonflight.

Thanks!