There will always be more to do.
The only way we are all identical is that we each live in a 24-hour day. Why some people accomplish more is therefore a function of how they organize their days and what priorities they have.
Yet, even they cannot accomplish everything they’d like to accomplish. We must realize that even when we pass from this life, we will still have uncompleted tasks “left on our plate.”
Be organized. Understand your priorities. Accept that you’re only human.