I've reached my $2.5K tax that I expect to owe for this year. On new W-4 21' how do I adjust so I get $0 more taken out? Adding $ to 4(c) line hasn't helped, 2 small?

Your W-4 form determines how much tax will be withheld from your pay. Use the Tax Withholding Estimator on the IRS web site to figure out what to put on your W-4 form. It will let you adjust your withholding to get the approximate refund amount that you want. Check it again in January. What you need for a full year at the new job might be different from what you need for the rest of this year.

Tax Withholding Estimator

If you want no more federal withholding then you can "fib" like you used to be able to do so you get the desired result in the end.   Simply enter some dependents on line 3 of the W-4.  

If you withheld $2,500 so far for your expected income tax this year,

and you do it again for the rest of the year,

you will get a refund of $2,500 on your tax return.

This is not unusual, but you are withholding too much if you don't want a big refund.

Sorry that is no help. I want $0 refund. At this point I am at this, now I want no more to be taken or at least not much. 

The only way to turn off withholding is to claim "Exempt". That would involve perjury.

in fact any attempt to withhold less than the calculated amount involves a W-4 that is not "true, correct and complete".

Using EXEMPT would be dead wrong .... but If you want no more federal withholding then you can "fib" like you used to be able to do so you get the desired result in the end.   Simply enter some dependents on line 3 of the W-4.