If you can understand some spanish (castilian) language you could find your accomodation opportunities on Gronze, maybe the most updated website (and app) about the Caminos in spanish ( gronze.com )
I've walked all the three Caminos i talked about to you in 2018 and i could always sleep in...
It also depends on how many days you have for walking.
The Camino Primitivo from Oviedo could be a good option if you can walk for 10-12 days;
whenever you've got 4-5 days more, you could add the Camino del Salvador, going from Leon to Oviedo and, from there on, walking the Camino Primitivo...
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