Proper response to a high rate of descent close to the ground is a significant increase in thrust to stop the unplanned sink rate, if in doubt go around being careful with the pitch until well clear of the runway.
Salvaging a landing with a significant thrust increase is not a normal or recommended technique but early flare is what FCTM recommends. If that is not sufficient then a GA.
From stabilized conditions, the flare height is about 30 ft.
This height varies due to the range of typical operational conditions that can directly influence the rate of descent.