Actually, when my daughter was playing HS volleyball only a couple of years ago. It was generally acknowledged that the midwest had execellent high school volleyball. Maybe that has changed.
"While exact state-by-state numbers aren't readily available in snippets, data shows over 470,000 girls played high school volleyball in the US in 2022-23, making it incredibly popular, second only to outdoor track, with states like California, Texas, Nebraska, and Minnesota leading in overall participation and competitiveness."
https://renathletics.com/blogs/news/the-best-states-for-volleyball?srsltid=AfmBOopcvV8k3-C7RW1XLyD5HJtxk2yolAuv8JZ8fljajE8rjo0oyuRu
1)CA, 2)TX, 3)NE, 4)MN, 5)IL, 6)PA, 7)WI
3,4,5 & 7 are areas UND recruits for other sports. I think a regional coach with strong connections should thive.