If you're willing to, I'd really recommend you to start watching YouTube videos in english or maybe even movies/tv shows in addition to playing games in english. If you want to start slow, watch stuff with english subtitles and once you feel confident enough, just get rid of them altogether. Just like you, I'm also brazilian and learned a ton of english just from playing games, but using other media to learn too was a huge help. I'd say I'm pratically fluent nowadays compared to when I joined the forums, my english really has come a long way since then.