Prolific authors who have faded into obscurity

When Pearl S. Buck came up when there was a similar thread back in 2010 and someone suggested that she was completely forgotten in the UK, I observed:

I may as well take the opportunity to recommend Christopher Fowler’s 2012 book Invisible Ink, based on his long-running Independent on Sunday column. The whole idea is to highlight once-famous authors or works that have been forgotten. He doesn’t quite recommend all of them, but it’s a good source of off-beat reading material, as well as a meditation on the vagaries of literary reputations.