It might seem simple but of course the fastest way is to practice speaking as much as possible. I assume that maybe you don't have people to speak to which is when this becomes difficult. If you are unable to speak to those around you or to take an online class, then the main thing is to immerse yourself in other English sources. Watch TV & movies in English with no subtitles, read the newspaper in English every morning and an English book or novel every evening. Listen to English Podcasts or audiobooks when you are out and about. All of this will improve your listening, grammar, vocabulary and pronunciation skills over time and in a short period give you topics from the news that you can discuss while also improving the listening side of your conversation skills. While doing all of this, try playing one side of the conversation of TV shows you are watching, give short speeches on topics from the news and practice reviewing the books or movies you are watching out loud. Try recording yourself to see how you sound compared to those in the movies. It is hard when you don't have anyone to speak to, but it can be done. Good Luck.