If an incorrect 2023 Form 8606 was filed (which is what appears to have happened) the incorrect form must be amended. I'll assume that the reported contributions were nondeductible due to MAGI and participation in a workplace retirement plan, otherwise there is also the possibility of an inappropriate Retirement Savings Contributions Credit having been reported on Form 8880.
When beginning your 2024 tax return with TurboTax, you'll want to begin by transferring in from the tax file that contains the amended Form 8606 so that the IRA Information Worksheet in 2024 TurboTax shows the correct basis is carried in from 2023.
Whatever contributions you and your wife make for 2024 are entirely independent of what was or was not contributed for 2023. Trying to fudge the numbers by entering a smaller 2024 contribution than actually made and not amending the incorrect Form 8606 will cause discrepancies between what is reported on the tax returns and what is reported to the IRS by the IRA custodian on Forms 5498, potentially raising a red flag with the IRS.
