What languages do you currently know?
I would recommend coming up with some project in either language that interests you, and gives you a reason and a purpose to learn the language.
Do you want to learn for personal projects, or for your job?
One of my "problems" is that I get excited about all sorts of things so I really need to focus on getting projects finished. That's why I feel I need to be in an either/or place right now, so that I don't over extend myself...
C++ is not generally a language people ought to learn unless they have to.