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I'd learn Spanish first, easily the most useful IMO. Latin-based just like Portuguese, French and Italian so makes it far easier to understand those also. On the other hand German, Dutch, Swedish (or Icelandic) and other Germanic languages should be the easiest to pick up for you since you already speak English.
Everyone here studies at least 3 languages at school, Finnish, Swedish and a third one that can be picked (fairly) freely. I've studied English, Swedish, Russian and French and I regret not putting more effort into them back then, far easier to absorb info into those play-doh brains. English, Swedish and German have a lot in common, and after studying the other two, German seems to make sense to me quite easily even if I've never studied it in any way. French is quite different to those, and Russian is from another planet completely. And of course Finnish is totally different to everything else mentioned.
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