Impressive sir.
Wars against the pagan tribes of the Baltic coast was easy enough, as they went into wars against each other, HRE and Sweden quite often. And I got Jacwiez from a good marriage with a local countess.
But now, I'm between HRE, which seems to be constantly suffering from civil wars, and a unified Rus. Future prospects of expansion seem rather slim at the moment, but I have managed to secure strong ties to Rurikovich family, the rulers of Rus, via various marriages. Same with the HRE.
Might look towards the Holy Land, when the next crusade is coming up, but we will see.
Also, economy of Poland is strong: Krakow, Danzig, Marienburg, Opole and Plock are extremely rich, so I'm happy with that.
I'm just upset about the fact that I'm going to loose the direct rule of Danzig with next succession, but I'm trying to figure out an answer for that too.