I have tried many times to try a new language but it is very difficult unless you can immerse yourself in it for a month or two.
Despight the fact that learning to speak French much much better would help me find a more decent job, the language I would really love to be able to speak is German. I personally find German one of the most important sounding languages in the world. There is something in the sound of it that makes it feel familure and noble.
I also love how they construct larger word putting smaller ones together. I would also live to hang out in a platz over a piaza.
That being said Italian would also be cool and more specifically Venician. Venice is one very amazing place that you can very easily lose yourself in.