Ok, I have a few solutions to the people with full vaults:
-Delete anything from year 1, most of it is getting upgraded
-Delete everything from your first page of the vault, it means you don't use it
-Delete anything unupgraded, because chances are, if you're a year 1 player, you have perfect rolls already
-Use the kiosks, they are there for a reason
-Delete exotics you never use
-Stop complaining about it, it's too late to add it, and Bungie said they weren't. The holiday kiosk was the last addition to the game to resolve vault space
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5 Ways to FIX VAULT SPACE (Without Increasing Vault Space