Each so-called expert has a different opinion on what to do to maximize your productivity but sometimes the solution is at your fingertips. And in this case, I say it literally.
Most of the things we do involve typing. Obviously coding is an important one but just think about how many emails you reply each day!. Therefore, there’s no doubt about it, the easiest way to get more things done is to speed up your typing (at least to the point in which you don’t need to look at the keys you’re pressing).
Fortunately, there are many (free) online tools you can use to practice like these two lists). And if you want a specific Typing Practice for Programmers, check typing.io.