You have 50+ hours MES in your logbook. You are good to go for the ATP MES. You'll need to have your CAA confirm to the the FAA that you hold an ATP, complete an ATP CTP, pass the ATP written, get some flight training and review what you missed on the written and pass a checkride. The good thing about doing the training and checking in a real airplane under part 61 is there is no required time for the training and ground school. When the instructor thinks you are ready for the ride they can sign you off.