I used to think such a thing was possible, and back in the day (1980 and 1984) I had some very lively discussions about how blacks would see that the Dims were screwing them, and that Reagan was the best option for them, and that they’d support Reagan perhaps as high as 40%. Didn’t happen: The Dims still carried the black vote with percentages in the 90s.
That does not mean we give up. We simply cannot give up the big cities to the Democrats. Trump and the GOP need to aggressively go into black neighborhoods and convince them that voting Democrat has brought them nothing but misery.