" If your job situation changed, you might get more money
If you became unemployed this year (2020) or your wages dropped,
that could lower your adjusted gross income, which is used to determine your payment.
For example, if you got a partial payment with the first or second check,
a third check could bring you a full payment if you're no longer employed." (cnet.com)
2020 년 '소득이 거의 없는 상태' 택스보고를 하여 3차 지원금을 받을 수 있다고 하네요.
(USA유얼daum 님이 언급했듯이. . .)