If you feel that your last quartly payments will be too much, yes you can adjust the amount up or down to meet your projected liability. The IRS has a tool that will help you estimate the approximate total amount of tax for the tax year.
https://www.irs.gov/newsroom/this-irs-online-tool-simplifies-estimating-2023-tax-withholding
https://apps.irs.gov/app/tax-withholding-estimator
The reason for estimated taxes is to avoid penalties from underpayment of taxes when you file your tax return.
Some states also have a similar tool on their State Taxation and Revenue website.
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