Like the 100 years war itself, it wasn't just 80 years of non-stop warfare, since the 30 years war was a part of the 80 years war as well.
Spain tried to take the Netherlands again after all of northern Germany fell, but eventually the Swedes came down from the north and beat the shit out of the Catholic Germans, even reaching parts of Czechia and Slovakia, and later keeping a bunch of that land as well as forcing Spain to relinquish its claim on the Netherlands. Christian IV also betrayed Sweden and basically lost Jamtland, Bahuslen, and Skane in the process, thus putting Sweden in a similar situation to Spain earlier. Too bad they didn't get Silesia as well. France was able to take back former Burgundian lands including parts of Flanders, Alsace, and England lost Calais, but they weren't a part of this anyways. The Bourbons also got a chance to steal the Habsburg throne from Spain, meaning that France could replace Spain as the new world power as they were already incredibly powerful to begin with (so much so that after this, it took a war of Spanish succession, 7 years war, revolutionary wars, Napoleonic wars, and then the Franco-Prussian war to actually calm them down and leave England to become more powerful than them). Then this happened:
https://youtube.com/watch?v=c-WO73Dh7rY [Embed]
That's the 30 years war in a nutshell.