Hello Tarun....
As you said you attempted 2018 and 2019 ,but could not clear the exam then you completed your two attempts.Now again you can attempt for the last time in 2020 as maximum 3 attempts are only allowed and if we consider two exams in a year then you can attempt this april exam and 2020's january and april exams .
You asked about jee advance you can only attempt it if you clear the jee main exam.
Jee advanced is for the people who cleared jee main exam.
Hope my answer helps you.....
All the best......

No candidate,
You cannot give advance in 2020.
This year is your last attempt as per rule.
As you pass 12th  exam in  2018, you only applies to advance 2018 and advance 2019.
Hope this helps you.
Regards.

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