The dedication is permanent and cannot be reversed.
People should come to realize when you abandon Satanism you are not abandoning the old gods, you are abandoning yourself. The gods are already gods they lose nothing when you decide to walk away.
It is you who turns down the opportunity to better yourself and the world around you. It is ultimately YOU who ends up feeling the consequences of this decision. The old gods do not guide or protect those who do not want to be guided or protected. Nor do they punish those who walk away, as these people already punish themselves.
Outside of cases of treason, the door remains open to those who wish to restart their Satanic path. Re-doing the dedication is not required as again, it cannot be reversed if it was performed properly.
Wanting to reverse the dedication usually only comes from falling into enemy programs. The dying god has no power or influence and with the steady decline of enemy programs it's days are numbered. So these fears are pointless.