Humble suggestion from ancient ex military instructor. Request your instructor to demonstrate the approach and landing from early base leg to touch-down. Get him to do this three times in a row with you just watching. Ask him to patter what he is doing. Ask him to do the lot - including the radio, while you sit back and absorb what he is doing.
Note his flare technique and then try and photograph that in your mind. Ensure no cross-wind as this makes early landings difficult to judge if the aircraft is also drifting. If you are still having problems after one more session, then it is your right to politely request a change of instructor. That is no reflection on your current instructor, but a change can sometimes do wonders. It can go the other way, too. But it must be an experienced instructor - not one straight out of CPL training.