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For example, Chapter 3, Season 3 of Fortnite is currently slated to end on Oct. 2, 2022. Unless the developers change this end date, you can expect your current arena points to be good until then. After that, when Season 4 is brought to the game, you and every other player will be returned to zero arena points.
Unfortunately, there is no way to carry your points over from one season to another. When they reset, they reset for everyone, regardless of your level in the game at the time.
Source: https://www.distractify.com/p/when-do-fortnite-arena-points-reset
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