If you meet the ATP requirements, 1500tt, 500xc, 250pic, 100 night, 75 instrument, then you can skip CPL/IR and go straight to ATP, BUT you will need to do an ATP-CTP course which is a bit like an MCC before you can take the ATP ME written exam. If you're short of PIC, you might want to write a new logbook as the FAA consider all dual received after your PPL as PIC.