Possessions become clutter when their reason for staying disappears.

Clutter is not a quantity, it is a lapsed purpose. Everything in the pile was kept for a reason that made sense at the time, and the reason quietly expired while the object stayed. That is why sorting is exhausting: you are not moving things, you are auditing old intentions.

Instead of asking whether you might use something, ask what it is still doing here. If you cannot say, you have your answer. Keeping the question that simple makes the work much lighter than the usual method of imagining every possible future.