Yes, you can amend last year's returns to carry forward the losses to offset this year's gains.
Prepare and file your amended returns first, then prepare and file your returns for this year. Fortunately, you do not have to wait for your amendments to be fully processed before you file your current year returns as this is not something that the IRS matches up right away.
Please see this TurboTax Help article: How do I amend my federal return for a prior year?
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