Are unique global cultures dead?

it seems apparent to me that they're dying, at any rate. by "culture" i'm not talking about the superficial stuff like cuisine, clothing or music.

I've been reading Count Keyserling's travel diary where he tours the world in the 1920s and the sheer unique vividity of each different peoples' worldview, belief in mythologies, and perceptions of time, space, life and death is incredible. But one specific passage stood out to me, his belief that the worldview and culture of Japan was surface-level to an extraordinary degree and lacked a defining core and soul (which is why they were able to shed off their old skin and adapt to the modern world so quickly.)

That used to be confined solely to the Japanese, but nowadays, it seems like 95% of the world is succumbing to the same sort of surface-level, cosmopolitan soullessness that was once unique to Japan. When you really get down to it, there isn't all that much which separates how your average current urban American zoomer thinks from his Chinese, English, Turkish etc counterpart. This isn't helped by the fact that the Internet is probably responsible for encouraging this soulless homogenity on a vast scale.

Will the peoples of the world ever be able to reclaim and rebuild their truly unique patterns of thought? or has modernity and mass intercommunication wrecked it for everybody?