A bit dower unless you accept that acceptance is the key. You have 4000 weeks to live. You will die. You won't be amongst the most rich, famous or most successful that have ever lived. And yet, once you understand this isn't unfair or wrong, that this is true for all of us, then you can find happiness and satisfaction with your life.
-- Focus on one big project at a time. Your to do list should not have more than 10 items on it. 5 is better. 3 or 4 is realistic. If your list is longer than that, you are doing too much.
-- Decide in advance what to fail at.
-- Focus on what you've already completed, not just what's left to complete.
-- Consolidate your caring. Pick your battles charity, activism, and politics. Take a hard look at social media.
-- Embrace boring and single purpose technology.
-- Be a "researcher" in relationships... More inquiry, less certainty. Be curious.
-- Cultivate instantaneous generosity. Give praise quickly.
-- Seek out novelty in the mundane.
-- Practice doing nothing. Become a better procrastinator. Learn to accept those fidgets that cause you to drop a task and switch to something else.