Yes you can! The special lookback rule will allow lower income individuals to use their earned income from 2019 to determine their Earned Income Tax Credit and the refundable portion of the Child Tax Credit in 2020 and 2021.
How to use the Lookback provision
https://ttlc.intuit.com/community/earned-income-credit/help/how-do-i-use-the-lookback-provision-to-m...
