Hello,

Cutoff of JEE Main always depends on a number of factors andthe important ones being:

(1) The number of candidates appearing in the entrance exam

(2) Total applications received for the programme to which candidate has sought admission

(3) Total available seats

(4) Difficulty level of the exam and 

(5) The category under which admission is sought

But if the number of seats increases the cutoff for a particular list would come down, and go up if seats are decreased. Likewise, if the number of applications increases, competition would go up, and so would the cutoff.

Hence, telling about 2020 cut off is a far fetched thing

For more details: https://engineering.careers360.com/articles/jee-main-cutoff