Welcome to my advanced English blog for C1 and C2 levels.
Try to practice your English as much as you can with the different links and documents. And remember...where there´s a will there´s a way...and "Ain´t no mountain high enough"
I recommend to listen to some podcasts intensively, focusing on the grammar and vocabulary as well as modelling your accent on the speakers´, but you should also listen to others in a more leisurely way as if you where listening to the radio. Playing a radio station in the background when doing something else can prove to be very useful too.