What do you have a whole lot of? Stacks of clipped articles you plan to read? 87 kinds of fancy mustard? Back issues of magazines? Lots of t-shirts with interesting imagery you never wear anymore? Enough coffee mugs to use a different one every day for a month? A collection of little owl figurines that people keep giving you?
What if they went away? (Or 90% of them) Would you replace them or be relieved?
Look around for that category of stuff you've accumulated out of habit, but which you wouldn't replace if you were starting fresh today.
Today, get rid of half of that stuffclot. Charity, recycling, trash. Whatever. More than half if you don't feel the pull to keep them, but at least get them down to an uncrowded level where you might actually use or enjoy the remaining ones.