With the Danes its simple. Keep Denmark well garrisoned to deter the HRE or whoevers occupying Saxony and rampage across Scandinavia. Then expand eastwards across the North and Baltic seas. Build up a trading empire with the British Isles in the west( Maybe add Normandy if you want to reclaim all the Viking lands :) ) , the rich Steppe provinces( Novgorod and Crimean region). Then, you will rule the world.
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