The big problem for me had always been speaking anxiety. I was terrified to get up in front of people and talk. And then, suddenly, I was not. I have no idea ho

The big problem for me had always been speaking anxiety. I was terrified to get up in front of people and talk. And then, suddenly, I was not. I have no idea how to induce this change in others, but I assure you that it made a far bigger improvement in my speaking style than any change in intonation. If you want to do what the article says, just listen to someone British for a while and then try reading some words aloud, enunciating carefully. Try to be as "accentless" as possible, whatever what may mean in your area. This becomes habit after a little while.