Two bits of advice from something of a polyglot here: Languages aren't something you learn, they are something you join. With Duolingo, take a second language

Two bits of advice from something of a polyglot here: Languages aren't something you learn, they are something you join. With Duolingo, take a second language along with the primary one. No, not German or French. Scroll all the way down to the bottom and select Latin, or Klingon, or Dothraki, something really short and just for kicks. That way when you are stuck in your primary language, you can switch to the fun language and keep up the habit. Duolingo is all about keeping up that habit. Also, you get to learn another 'language' and checking that off feels good and makes it so that you want to be a polyglot.