- I boosted a character and I don't have the Heart of Azeroth
- I am unable to start the quest A Dying World
The Shadowlands boost doesn't unlock the Heart of Azeroth.
If you want to obtain the Heart of Azeroth, you must complete the quest A Dying World. This quest is pushed to you when you visit your capital city Boralus or Dazar'alor.
If you abandoned the quest line in error, go back to Boralus or Dazar'alor and talk to the Earthen Guardian to help you get back to the Chamber of the Heart.