Reduce your accent by developing a certain way of speaking called a non-regional dialect. A non-regional dialect is most commonly compared to the way people speak in Iowa, Kansas and Missouri in the United States. Develop a non-regional dialect by studying the way people speak in this region. Also, study national newscasters, because the dialect is what those in television news strive to have. People listening to the news prefer to have someone speaking that sounds as if they could be from anywhere, instead of an obvious region of the world, like the deep South, England or Mexico. Listen to newscasters on national news, and on local news programs in big cities. Repeat the words that they say, and pay special attention to words that sound different from the way you normally speak. Listen to the news each night and speak back to the newscasters. In time, you will begin to sound non-regional.
Employ the aid of a dialogue coach to help you reduce your accent, in the same way that you would use them to develop a different accent for theater or movie roles. A dialogue coach works on specific phrases and words to teach you how to make the sounds required in a particular dialect. Similarly, they can help you reduce your accent by telling you how to say certain words non-regionally.
Reduce your accent by reducing the number of times you say words most commonly associated with an accent. Each accent has its own slang and colloquialisms. In the South, people say "y'all" meaning "everyone" or "all of you." In Canada, the phrase "eh" is used before or after questions or sentences. Pay attention to the things that you say that are colloquial or slang, because these are the words that will make your accent sound thicker. Learn new, general ways to say things, and eliminate the unnecessary words from your vocabulary. The less you use these phrases, the more general your accent will begin to sound.