The One Thing is good. It was free to read on Kindle for Prime members recently. The OP should check if it's still there.
The hard part is figuring out the one thing. Tim Ferris talks about this a lot - finding the one thing that makes other things you want to do either irrelevant or so much easier. This concept has lots of names. Jocko Willinks books Extreme Ownership puts it simply as "prioritize and execute".
Anytime I feel overwhelmed with the amount I have to do what I have really done is not prioritize.
And yes, it is not easy and requires daily discipline.
The hard part is figuring out the one thing. Tim Ferris talks about this a lot - finding the one thing that makes other things you want to do either irrelevant or so much easier. This concept has lots of names. Jocko Willinks books Extreme Ownership puts it simply as "prioritize and execute".
Anytime I feel overwhelmed with the amount I have to do what I have really done is not prioritize.
And yes, it is not easy and requires daily discipline.