If you are looking to adjust for 2021 this late in the year then DON'T ... if you don't change it back in January you will be really sorry next year.
Use the Tax Withholding Estimator on the IRS web site to figure out what you and your husband should each put on the W-4 forms that you give to your employers. It's much easier than using the worksheets on the form. It will let you adjust your withholding to get the approximate refund amount that you want.
Tax Withholding Estimator
