The Anemo Hypostasis like most of the hypostasis has a specific way on howto beat it.
The Anemo Hypostasis specific way to. beat it is that when it reaches a certain Hp threshold, a bunch of anemo energy orbs will appear, toget those orbs you must use the wind currents that will appear toget them all.
This is just a picture showing of what the boss looks like during this stage. As you can see, the Beidou is using the wind currents to move around and get the orbs.
If you do not get all of them then the Hypostasis will come back with more hp, but if you get them all, you can kill it for good. Other than that, none of its attacks are anything to write home about, just don’t use anemo character for damage.