I just saw this article from National Geographic about how walking the Camino in Germany (which is part of the Camino de Santiago) rather than Spain can take you through some incredible scenery. One 100 mile trek they mentioned runs from Koblenz to Trier, and takes the traveler through the wine country along the Moselle, "...past grand castles and ancient churches to the Roman outpost of Trier, the oldest city in Germany."
And of course, the crowds are much less. Spain has been overrun by tourists in the past years, and the German Camino is much less traveled.
The German Camino—part of the intricate Camino de Santiago—offers walkers along this path historic landmarks, scenery, and a similar hiking experience to the French Way without the crowds. It’s not uncommon for travelers walking the Way of St. James to have the path to themselves.
Anyway, read the article. I think it sounds pretty fascinating. I'm not sure I'd be up to it physically but you never know! https://www.nationalgeographic.com/travel/article/germany-camino-de-santiago-alternative