Hello Pranshu

Yes you can give exam one more time,which is in year 2021.But as per JEE Advance criteria JEE Advanced can be attempted a maximum of two times in two consecutive years by the candidates. But There may not be any age limit for JEE Advanced 2020 since in the previous session, the Supreme Court had ordered that candidates who are 25 years and older will also be eligible for the examination. However, the admission would be provisional.

You can check more information about exam here https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria

Hope This Helps

Best Of Luck!!!!