You can file an amended return. See How to Correct Federal Tax Returns - TurboTax.
An election (or any specification made in the election) to take a section 179 deduction for 2020 can be revoked without IRS approval by filing an amended return. The amended return must be filed within the time prescribed by law. The amended return must also include any resulting adjustments to taxable income. Once made, the revocation is irrevocable.
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