You could Learn french and get an extra boost with the TEF. I did it in the beginning of this year and got a boost of 9 CRS points.
I got from 0 to CLB7 in 3 of the 4 categpries, in a period of only 4 months. The Speaking category I only got to CLB4, because I didn't have anyone to practice with. It is truth that, because I speak english and spanish, french was easier than it may be for people not coming from a romance tonge.
But if you take, say, 6 to 8 months, really practicing one to three hours everyday, you could get to a CLB7 in all 4 skills.