This weekend picks three artists that you like in the music industry and listen to their songs. I strongly recommend to listen to an artist that sings proper English which means an artist who takes his time to spell the word out. Also, It is important to have the lyrics because it will help you getting familiar with the words and the pronunciation.
Suggested artist: Lionel Richie, John Legend, Elvis Presley, Mariah Carey, Celine Dion,
Also do not try to get the american accent or British accent because the more you focus on your accent the more your brain will take time to assimilate the words. It is better to use your native accent because the first thing you need is to know the word and saying it right.