There are a few scattered modern tribes around the world that have different menstrual rituals like the Yurok of North America or some African cultures with women's societies that are not as
Most period-positive mythologies that existed in antiquity have been either completely wiped or edited to match a patriarchal narrative, so a lot of the new agey stuff is people's attempt to piece together ancient female religions (or completely modern frameworks) with limited historical information as well as their own modern needs. I'm not an historian so it is difficult for me to know for sure how much is woo and how much is real, but something in it feels really intuitive and meaningful so I can't help but be moved by the idea. Of course take all of this with a grain of salt and look into it yourself if the idea interests you.
A great book about mythology and menstruation was The Wise Wound by Penelope Shuttle, it was my intro into questioning narratives behind menstruation. I think it was the first major book contemplating why menstruation is such a taboo. It brings in mythology, history, psychology, and some medical science to explore the question. it is a bit old, bit still good. its on the internet archive: https://archive.org/details/wisewoundmythsre00shut/mode/2up
I also liked some books by erich neumann. specifically fear of the feminine. It doesn't directly imply menstruation but it was still useful in making a good female-positive mental framework. He uses a jungian framework to examine feminine psychology and mythology.
Blood Magic by Alma Gotlieb is an anthropological book on different culture's ideas around menstruation. It's on my list but I havent gotten around to it yet.
In general, mythologies in which the moon or the number 13 (13 lunar months in a year) are prominent usually have some proximity to the menstrual cycle. The king arthur myth about the 'grail that bleeds' could be read as a menstruation myth. It is a stretch, but even jesus christ could be seen as a menstrual symbol (born of a virgin mother, bleeds, and is resurrected again. 13 disciples if you count mary magdalen). Though both of these are heavily colored by patriarchal narratives.
Definitely read one of the books I listed since I probably don't do thPost too long. Click here to view the full text.