There are 3-4 Windwheel Asters each location, and you can get around 30 in total.
You can get about 14 Windwheel Asters.
Puzzles, Secrets, and Hidden Chests in Liyue
Top Mining Spots
Mondstadt Region Puzzles, Secrets, and Hidden Chests
Primordial Jade Regalia
How to make & link your MiHoYo account