Forgot to address it but I think
@MartyMcFly is right in his earlier point, Cyborg really isn't that type of character anyway. And i also agree with@obarth in that not many characters in general are, even if you remove the qualifier of being a "black" superhero.
Cap is the embodiment of America's pride and idealism. (Arguably white America if you factor his look). Wonder Woman embodies feminism, arguably white feminism. Black Panther obviously is an embodiment of African pride, or black pride. And although their race, gender and patriotism aren't brought up like the others, Batman, Spider-Man, Superman, Iron Man are more covert representations for white males. However, the thing with all the characters mentioned is they have a cool factor and appeal that can transcend any specific demographic.
Spider-Man and Batman have obviously been the shining examples of this for decades now, and at the end of the day, all these fictitious characters are "superheroes" meant to give fantasy wish-fulfillment/escapism to kids and young people. They're supposed to embody great things or great concepts.
Which is where Cyborg falls a bit short because everything about him feels more like the person who you'd rather have be your friend, than the person you'd actually want to be. And why i agree that a John Stewart or Static Shock would work better. And a shoutout to Vixen too, who is a bit underrated.