Deciding what to drop is the harder skill
Prioritising gets all the attention, but a ranked list of things that shouldn't be done is still a bad plan.
Most overloaded lists are overloaded because nothing ever leaves — items are deferred rather than declined, and deferral is not a decision.
The three questions
Is this actually mine? Plenty of items are someone else's work that arrived in your list through a conversation. Give it back.
What happens if it's never done? Not delayed — never. If you can't name a consequence, that's the answer.
Would I take this on today? Judge it as a new request rather than something you're already committed to. Sunk cost keeps a lot of dead work alive.
Decline properly
Silently not doing something is the expensive version, because whoever's waiting keeps planning around it.
Say it once: "I'm not going to get to this — do you want to reassign it or drop it?" That takes ten seconds and removes the item from your list and their expectation simultaneously.
Make it a routine
Once a month, read the whole list and delete anything carried for over a month without action.
It will feel reckless the first time. It won't the second, because almost nothing you deleted came back.
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Frequently asked questions
What if everything genuinely needs doing?
Then it's a capacity problem, and the decision is about sequence and who gets told what slips. No prioritisation method creates hours.
How do I decline work from my manager?
Don't decline — state the trade. "Yes, and that moves the Thursday report to Monday — is that right?" You're surfacing a cost, not refusing.
Should I keep a list of things I'm not doing?
For a while, yes. It makes deleting feel survivable, and after a fortnight you'll find you don't want most of them back.