just go in your vault and get nasty with it and delete 60 things, you'll feel better for it
start with unused exotics - you can always rebuy them (weapons)
doubles of anything - unless it's god roll, you only need one
any weapons that have high kill counts but you can rebuy - this was the hard one for me - but I can rebuy it so I'm good - though I did keep a couple
my vault was always at max now it's at 440 and I feel good and have room for beyond
I think Bungie is going to update weapons to what they’ll call weapons 2.0, and that it will be similar to how they do armor 2.0, and people will have hoarded hundreds of weapons they never even used, because the updated weapons system will be better, and they will now have to replace them all, and instead of just enjoying the game, they’ll have spent 3 years wanting a bigger vault to collect even more gear that will have never even used. True story.