hello there,

Look it is quite difficult to tell you about this year's cut off as it depends on various factors like: Number of aspirants appearing for the exam,
Number of aspirants applying for the exam,
Number of aspirants qualifying the exam,
Difficulty level of the paper,
Previous year cut off trend

with a sc category rank of 20,190 you do have chances in government colleges but you won't get into top branches or top colleges. You would have lower and newer NITs, IIITs, and GFTIs .

check the cut offs here: https://engineering.careers360.com/articles/jee-main-cutoff

Also, You can use the college predictor tool and participate in Jossa counselling to get a list of colleges available to you:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope it helps!
ALL THE BEST