Excess Contributions for 401+ IRA

I contributed 6000 to my Traditional IRA in Jan 2021. In the Middle of the Year, my employer introduced 401K and I started contributing to it as well and I will reach the 19,500 limits for 2021.
I make more income so that I cannot deduct both 401K and IRA.

Do I need to withdraw the 6000 from the Traditional IRA? If so it's all invested in stocks and how can this be withdrawn with Minimum Taxes?
Can I also leave this in my Traditional IRA as a Non-Deductible contribution and don't any anything? Please suggest a better way to handle this. Thanks in Advance.