I realize that this is a purely personal anecdote and I realize this is not how people get rich, run a triathlon or change the world, but maybe I just can't do those things.
I think some of the frustration comes from not sticking with any one thing long enough to get meaningfully better at it.
This isn't to say that it's not good advice, but when I spent my life relentlessly trying to optimize (a trap I still fall into frequently, I'm reading these comments after all), I just got frustrated and felt like a failure. I decided it was OK to watch a TV show I enjoyed, to read books that had nothing edifying except a story I enjoyed or to simply waste time.
I think regular self assessment and awareness are possibly more important that optimization or improving.
Off topic, but if you're interested in sports theory and writing, Suarez always makes me think of John McPhee's "A Sense of Where You Are", a profile of Bill Bradley when he was at Princeton. Probably one of my top 5 favorite sports books or articles.
And that's ok! And neither will I. I think some of my enthusiasm comes from picking up soccer later in life. I've found learning things as an adult is a totally different skill from learning as a child. By accepting that my goal is improving myself, and not competing with the world's best, I've found great joy in the smallest steps towards being a more perfect player.
Eh, this only works if the stuff you enjoy happens to line up with "productive" activities. :P