You don't need to amend for that. There's nothing you need to do or change. It won't change the adjusted refund.
Did you not get the 3rd Stimulus payment? Or qualify for more? Line 30 is only if you didn't get the full amount or qualify for more. The IRS shows they already sent it to you.
A lot of people forgot they got the deposit last March - May 2021. Or missed one payment and entered the wrong amount. Then when the IRS reduces their refund and they check their bank accounts they have been finding the payments.
Double check your bank statements and Check your IRS account (both accounts if married)
Your Online Account | Internal Revenue Service