How to track XIRR after long term redemption and reinvestment

I had invested 3L roughly 3 years ago in ELSS fund now it is going to get released for redemption in next few days. I am currently sitting at 60% profit with XIRR of 20%.

I am planning to withdraw all of it and reinvest to get benifits of tax benifits of 1.25 lakh. But I am worried that doing that will mess up my XIRR and I want to be able to track it properly throughout my investment journey.

I wanted to check with you folks how you currently deal with this problem and still claim 1.25 lakh tax benifits.