[tduberne]

A lot of the advice given is good, but I would like to add something I did not see: you can only be really fluent at a language you practice daily. I speak three foreign languages fluently, and speak two of them daily (English and German). I barely speak my mother tongue (French) with anyone else than my 3 and 1 yo. I am not really fluent at my mother tongue anymore, and my family often makes fun of how I speak, which is often a straight translation from English or German (and I apparently also have a German accent), with lots of pauses to search my words. Of course, one week in a French speaking environment and fluency is back.

What I want to say with it is: do not worry too much. Read, listen and speak English with natives, and you will keep a decent enough level to gain real fluency any time you get immersed in an English speaking environment.