https://wccftech.com/destiny-2-seasons-will-be-available-all-year-long-starting-with-season-12/

Destiny 2 Seasons are about to get some big changes, as the game's developers detailed in their latest weekly blog post.

Bungie Creative Director Evan Nikolich explained that there'll be an effort to weave a more coherent narrative through Destiny 2 Season. Furthermore, the activities will be available all year long starting with Season 12, though there will still be times when old pieces of content are removed to make space for new ones.