learning a new language should be something fun for you, something that you do because you really want to, Not for obligation or need. In these cases it takes longer to learn. if you want a perfect english you should practice everyday, at least talking to yourself at home, that's a good practice. Then watch videos on youtube or talk to people on the internet. Write as much as you can in english. I wish i could have time to learn Japanese, i really like your language.