I have always credited Wayne and Rhonda Byrne with lifting Neville’s popularity, among other factors. E.g., my Medium piece from January 2018: https://medium.com/s/real-magic/is-your-imagination-god-b55dc78e93bb

“The metaphysical teacher Neville, who wrote and spoke under his first name, has been growing in popularity since his death, in 1972, and particularly in the past decade or so, when a wide range of metaphysical writers, including Rhonda Byrne and Wayne Dyer, named him as an influence. A historical profile of Neville that I wrote in 2005 has become one of my most widely read and reprinted pieces. Neville’s books are entering multiple editions, and his lectures, preserved digitally from recordings that he freely allowed during his lifetime, receive hits numbering in the hundreds of thousands.”