Retirement tax questions

I do have a child who is my dependent. I made $1,991 in 2020. It asked if i wanted to use 2019s income since it was higher than 2020 instead so i said yes. It asked me for the w2s from 2019 so i input those. It increased my eitc to $3545 by using the 2019 income and 2020 plus my dependent. I already claimed 2019 and got the return for that income last year. So im kit sure how I'm able to claim it again but i just followed the prompts from turbo tax. Someone else said this was not the right thing to do... Im just hoping it was right bc i really need this money to pay off debt.