How do I make the strongest, largest Danish Empire possible?

In OTL Denmark (Denmark-Norway) colonized small settlements on the Gold Coast and across India. Denmark successfully colonized half of the Virgin Islands, along with Greenland, Iceland, and the Faroe Islands. All of this territory is either trivial in size or so barren & cold that it's useless.

So, what PoD allows for the strongest, largest Danish Empire possible? Preferably, Denmark keeps all of Schleswig-Holstein if not more of Northern Germany.
 
How late do you want to start? Having Denmark in personal union with Britain if Queen Anne and her husband have children and certain thigns happen is possible. From there, just have that king have a couple siblings (or, if Salic Law was practiced, a son to rule Denmark and a daughter to rule Britain). In the peace settlement, Denmark indemnifies Britain monetarily and gets some of her colonies in return. That will be a good starting point.
 
Perhaps it could tie itself to the Hanseatic League in the Middle Ages? That'd spare both sides some costly squabbling, and potentially give their combined forces enough strength to compete with the other European powers on the naval front, and become a force in their own right during the initial wave of European colonization.
 
In OTL Denmark (Denmark-Norway) colonized small settlements on the Gold Coast and across India. Denmark successfully colonized half of the Virgin Islands, along with Greenland, Iceland, and the Faroe Islands. All of this territory is either trivial in size or so barren & cold that it's useless.

So, what PoD allows for the strongest, largest Danish Empire possible? Preferably, Denmark keeps all of Schleswig-Holstein if not more of Northern Germany.

Size isn't everything. If you get ahold of sugarcane territory, that's a valuable import. If you get ahold of spices, that's incredibly valuable.
 
AS @DJjablonski say a more successful Kalmar Union, or at least an formal Union of independent kingdoms, ala Castilla-Aragón, that let you maintain the country united for a couple of centuries before they integrate in one country, Your problem will be always maintain enough swedish independence to they want to maintain in the union, but no too much that they will be de facto independent
 
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