Build the bracket in the right order.
- Complete the quest chain that unlocks the Heart of Azeroth, then use its catch-up quests to raise it to level 80.
- Complete the legendary cloak and essence quest lines before treating the character as ready.
- Run Mythic Battle for Azeroth raids for gear only after those quest lines are complete.
- Leave Ny'alotha until the unlocks are finished so its boss kills can award Echoes of Ny'alotha.