Latinos and Blacks differ
The dynamics of the two ethnic groups in America is different but the decision is now not based on history. This is something blacks won't do in large part. They must move past slavery and into the now. 95% plus of Blacks have no political empowerment because they are lockstep as Democrat voters. They may have to fall further and they will to Latinos now on the Democrat radar more than blacks because of birthrate aka future votes and economic power.
Latinos are smarter than blacks in that they don't vote as a monolithic block. Yes they're largely Democrat voters but they can be appealed to on policy.
The GOP needs to start now. Worry less about the reward and solve problems. The reward comes later.