[2020] How do I get to the new quests?

0.7.8 includes Chapter 8 of the story, and starts in Heoborea because that’s where Chapter 7 ends.

If you haven’t played since October, the latest chapter available then was Chapter 6, which ends in the Immortal Summit in the Imperial Era. You’ll need to fight the boss again, then you can continue the story.

If you did some endgame (monolith/arena) on that character at the time, you might be overleveled for the new story content. Just a heads up.