There is "NO PREDICTION" in the current rank. Currently 28,000 aspirants have submitted their responses and the rank shown is out of those 28000.
https://gateoverflow.in/mymarks/VisualizeMarks.php
If you see the marks to get same rank as in 2018 is pretty high. I do not know the exact reason but mostly this is due to some typical topics being missing from the paper and more importance given to Mathematics and Aptitude thus giving some advantage to freshers. This year aspirants bought nearly 1000 GO hardcopies as compared to just 70 last year. This might have also increased the marks especially of first timers who are not really familiar with GATE Overflow site. Anyway writing on the wall is clear for future aspirants -- 70+ is required to be safe. If you have no hope for this, better try something else than giving GATE. (Those scoring 45+ should have decent chances in other exams like BARC, IIITH PGEE etc.)