That is amazing! What a wonderful accomplishment, to go further than you ever have before in realizing a lifelong ambition. And it's lovely that you are finding so many shows and books that you enjoy watching and reading - that's a fantastic way to both learn more of the language and enjoy it at the same time!

One thing I used to do when trying to learn more French was to read in French works that I already knew well in English - Les Miserables, The Hound of the Baskervilles, Twenty Years After - because that really sped up, for me, the process of picking up new vocabulary contextually rather than having to pause to look things up. There are a lot of 'classics' with free audiobooks available in Dutch, it looks like:

http://www.loyalbooks.com/language/Dutch

http://www.gutenberg.org/files/30933/30933-h/30933-h.htm

There's a question, I suppose, about how good the translations are. But still, it might be another fun little way to pick up some more words :)

Congratulations, this is exciting news!