The good thing about German is that it's not hard to get to B1 level, however things start getting harder after that. I, for one, am stick on the B2/C1 plateau

The good thing about German is that it's not hard to get to B1 level, however things start getting harder after that. I, for one, am stick on the B2/C1 plateau for a long time, and lots of expats struggle with it. I would love to see how you tackled the Adjektivdeklinations issue in German. For me that has been an achilles' heel, and there's simply no easy way around it.