Try Wylding Hall by Elizabeth Hand, Water Shall Refuse Them by Lucie McKnight Hardy, Starve Acre by Andrew Michael Hurley, the Reddening by Adam Nevill and Winterset Hollow by Jonathan Edward Durham. I love folk horror! Probably my fave sub genre within horror.
Great Video, I love that the folk horror genre is moving forward in modern literature. Valley Versus Vision: Folk Horror in the Willamette Valley by Jahan Ihsan is a terrifying new Lithuanian and American folk horror. I highly recommend it.
Another Adam Nevill book that had folk elements is House of Small Shadows. As you near the climax it definitely starts to get into the more Wicker Man esque vibes