I love that you are opening up the gates, as it were, to diversify your flow of information.
Rather than suggest people, I’d suggest looking into some fiction, poetry, and other stuff that doesn’t tend to get attention on Medium.
My buddy Stephen M. Tomic is one of them, as is Anna Now. Those two would know of many others in the fiction realm. Anna’s post on “The Smaller Medium” has some good points, and the term has kind of taken off
As far as a diversity of race/ethnicity, I’ve found Daniel Johnson to be pretty poignant on race-related topics. I’ve found Thaddeus Howze good as well. Ezinne Ukoha also posts some interesting stuff. Tchassa Kamga is also quite good.
That’s all I’ve got. Happy hunting!