A simple way to help improve your English is to always surround yourself with the sound of English.
When you are at home always have the TV or radio on. You do not have to watch the TV or listen to the radio, but just having the sound of English being spoken will help with your intonation and pronunciation. You will even be able to recognise common phrases used by native speakers.
I recommend watching or listening to CBC to hear very clear Canadian pronunciation without too much slang.