MY advice is to watch as many movies/read as much as you can in that language...just keep it around the house. Even just playing it in the background helps, with subtitles, or without. Especially movies which you already know a lot of the script.
I took French for years in middle/high school, and was not quite fluent but was conversational at least....I felt like I lost so much of it after I graduated, but recently watched a few movies and understood a good deal of it, also am reading some (easy) books in French, and can understand a good bit of them.