any chances of lowering cut off for NEET SS 2019 second counseling?

You havent mentioned which State Counselling are you enquiring about. Generally, its not the cutoffs that are decreased. Lets say for Round 1, the first 100 people were invited for 100 seats and their score is between 600-500 but only 50 seats were filled up. Here the cut off is 500. Then Round 2 will be held and candidated from 101-200 will be called. Now lets say the marks range is 500-400, the cut off will be considered as 400. But again if out of 50, only 30 seats have been filled up, the next in the list will be called. So as the rank in the merit list goes higher, the marks scored becomes lesser. And the last rank or score that secured the seat is considered the cut off.