If focus is the path to success in baseball then how do you learn it? It's actually not as hard as you might think.
Using a tool called a concentration grid is one of the most effective.
To complete it is simple. Once a day. Time yourself marking off the grid from 0 - 99 in order. Don't worry if it takes you forever the first time. I was around 12 minutes. In about a week I was at 7.
Here is a good source to use. https://cgridid.com
You must feel in order to change. This teaches you what focus feels like.
Know the Why