Estimating tax deductions for no tax return

I’m trying to calculate (or at least estimate) my tax deductions to end up having no return on my taxes at year end. Every year I get a roughly 6k return and, although it’s great to have that before summer, I’d rather not give the government an interest-free loan.

I used the IRS withholding estimator but it’s pure trash. I accidentally withheld income from a few paychecks and the IRS thinks I make about 10k more a year than I actually do and should get about a 30k refund. It seems like they don’t take into account income withheld during the year.

Does anyone know of spreadsheets, equations, or any resources I can use to estimate my tax withholding at least well enough so I can trial and error this?

Also, would this be the only way I can “retrieve” the withheld income besides waiting for my return? Would my company be able to do something for me?