The only true reparation is to put them in the same position they would have been in had there been no slavery. That means stripping them of everything they own and shipping them off to Africa.
Personally, I would prefer to see the whites packed up on ships and sent back to Europe where they came from first.
In all candor your response is racist and harsh.
There are no ex-slaves to "strip and send back to Africa." There are only people whose ancestors were slaves generations ago. So by what logic should these innocents be deported? And, as a subsequent poster somewhat rudely replies, who sends back who is a formula that can only compound past injustices.
But we note in the interest of historical accuracy that the solution you proposed was in fact the solution Lincoln, the great emancipator, actually believed would be the best for all at the time of his demise.