Life is too short to do everything but life is more than ample enough to do important things, things that count beyond the mundane routines of daily existence. This life is but a breath or, as my 100-year-old grandmother said shortly before she passed on, everything that she had experienced to that point was "but a blink." When you can get to that stage and say, "no regrets" for a life well-led, you can have peace with your finite capacities and your finite existence in this world. There is much that is beautiful to do in this life. You don't need to do it all. You just need to do it well.
I can't really add to that. Well-said.