Recent trends and ever increasing competition in NEET PG, suggest that 650+ is a safe score, so to say!
For reference, NEET 2020 75% Marks (900/1200), secured a rank in top 120.
NEET 2021, 80% Marks (640/800), secured a rank in 600s
Thus you can very well see the level of competition.
Of course all these are true if you are unfortunate enough to be from UR category. So I’d suggest gear up, put in your best efforts in Med School, borrow 5–6 Lakhs from parents and take PLAB and leave this place. If you can afford it, take USMLE. But PLAB is very well doable even while working as a JR in corporates.