The 90/90 Rule
When trying to figure out which items to keep around the house, ask yourself the following questions:
Have I used this in the last 90 days?
Will I use it in the next 90 days?
If the answer to both questions is no, consider getting rid of them (i.e., sell, give away, or donate them).
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If so inspired, reflect on this process in your Project Quartz journal.
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Bonus: While the 90/90 questions aren’t immediately relevant for seasonal or sentimental items, they can be modified if you find them a useful filter for decluttering (e.g., Did I use this last season/holiday? Will I use it next season/holiday?).
Source
The 90/90 rule was created by The Minimalists.