Technically, you should read books and try to understand the pattern of the sentences. Have a good friend that'd talk to you in English only. Talk in english even if you think it's not as good. Just talk your heart out. Learn from mistakes-don't get shutdown by simple mistakes you do, and don't ever think you will never improve. *As kids we also didn't know how to talk Amharic, our mother tongue which we use fluently now. So it's all about using it frequently and never giving up no matter what people say about your skills. Don't get embarrassed easily if you make errors, instead use them as a stepping stone to learn what you lack. Hope this helped. Good luck!