Defeat the Ender Dragon
Enter the End gateway that appears after the fight
Use an Elytra or bridge across the outer islands
Search for purple chorus plants and tall end stone structures
Look for End City towers made of purpur blocks and end stone bricks
Travel far from the main island in the outer End
Use the `/locate structure end_city` command if cheats are enabled
Use a map or coordinates to mark explored areas
Search near End ships attached to End Cities
Keep moving in one direction to cover more territory