What do I do if I already filed my 2020 tax return and claimed the recovery rebate in order to get my stimulus check? I finally received my check in the mail. So now what

I didn't think I was going to receive a paper check because it had been so long, so I filed my 2020 taxes to receive it that way. But a week later I finally got the paper check in the mail. So Im not sure what I should do now.