Share your experience of learning English

Hello, everyone,
This is Shirley. I have not been here for several years. In the follow months, because of my work,  I must stay here to learn some quality management knowledges. 
Long time no focus on the website. I expect to know how you improve your English during the spare time? In the past years, maybe some guys have achieved a higher level. To be frank, I look forward to hearing your experience.
Thank you very much.