That's genuinely great advise! The same works for rewatching shows where you almost know the dialogue by heart.

I learned English by reading Anime subtitles, playing video games and swapping my OS to English, too. Lots and lots of vocabulary, metaphors, pronunciation and grammar all the time, from all sides.

This is called immersion; trying to incorporate something you're learning into as many things in your daily life as possible. Give it a shot, you'd be surprised by the results after only a year!