I had a similar experience where I gained a strong sense of how ancient humans and modern humans are one and the same.
It was individualistic in that the sense came from my own embodied experience of being in the world, and I was thinking about myself, but it was an insight about contextualizing myself in a much larger thing.
It made me feel special, personally, for being a member of such an incredible group, but anti-individualistic because I extended this specialness to everyone.
In general psychedelics strip away your ego such that your self appears illusory. I've never met anyone whose takeaway from psychedelics was individualistic.