JC Powys (1872-1963) was a really interesting and important writer who wrote some passages that have stuck with me ever since reading - I have read about a dozen of his books, and another dozen biographies, his letters and critical studies.
As a writer Powys is extremely strange and about as sprawling as anybody - so he is not to all, or most, tastes - howver, he attracted some significant and impressive readers over the decades (https://en.wikipedia.org/wiki/John_Cowper_Powys#Reputation) : a cult writer, in other words.
Where to begin? Probably the novel Wolf Solent or his Autobiography which is without doubt one of the best of autobiographies. The enormous A Glastonbury Romance has its moments, but I have only dipped into it. As a biography Old Earth Man by HP Collins was good enough to make me re-read it.
I would say that Powys was the most serious and committed of neo-pagans - he took that attempted religious revival just about as far as it can be taken - showing what it can do, and its limitations.