Look on line 12 of each year's Form 1040. You will see your standard deduction there. If you believe that your itemized deductions would be better, you can amend to itemize.
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
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