To earn XP on a Creator-Made Island in Fortnite, you can choose from several maps that offer fast XP gain and help you complete the Break the Curse Questline. The best maps for this challenge are The Pit-Free for All, 100 Level Lava and Water Deathrun, and Highschool RP.
On The Pit-Free for All (5242-0176-3631) map, you can earn XP by destroying the island's construction with any weapon. XP is awarded every 15 minutes, but you must be active in the last minute before the reward is given. Stay active during the 14th minute to ensure you receive your XP reward.
The 100 Level Lava and Water Deathrun (4055-9186-0515) offers a challenging experience but rewards you with a good amount of XP. As you progress through the levels and collect coins, you can quickly accumulate around 750 XP per coin. Some levels even have multiple coins, allowing for faster XP collection.
Highschool RP (6351-9562-0264) is another map where you can earn XP by attending classes and playing mini-games. For example, performing an emote in one class can give you around 4000 XP. By participating in different activities and attending classes, you can quickly earn the desired amount of XP and also receive 450 Cursed Energy as a reward.
Other popular maps such as Battle Lab and Pro 1000(XY) can also provide a good amount of XP. Remember that you can complete this challenge on any Creator-Made Island, so you can choose your favorite creative map and still earn XP.
In Fortnite's Creative mode, there are many ways to collect XP quickly. By following the strategies mentioned above and selecting the best Creator-Made Islands, you can complete this challenge in no time. Collect coins, attend classes, play mini-games, and complete challenges to accumulate XP and progress in the Break the Curse Questline.
If you prefer visual guidance, you can watch the video provided by Comrad3s for a walkthrough of The Pit-Free for All map.