The book, The One Thing, by Gary Keller and Jay Papasan has challenged my thinking about being a jack of all trades, yet a master of none. This book was a gift from a brother about 6 years ago, and I have intentionally read at least 4 times since then.

Here's a link to my notes from this last review in 2021.

The One Thing, Lana's Notes

You should buy the book and read it too, but I hope this cliff note version gets you thinking about your One Thing.