It sounds like based upon your entries when you prepared your original return, your standard deduction was higher than your itemized deductions. This would have allowed you to claim the $300 above the line adjustment.
Standard deduction versus Itemized deduction
You will not be able to carry forward your charitable contributions. They would only be deductible in the year of the donation.
I recommend looking at your total itemized deductions and comparing it the standard deduction amount that applied to you for your filing status in 2020.
Standard deduction amounts
If you determine the total amount of your charitable contributions would allow you to itemize, you should amend your return to include those donations.
How to amend my return?
If adding the donations does not allow you to itemize, there would be no overall effect on your tax return and you would not need to amend as your tax return will not change.
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