TurboTax did a software update and my Fed Refund doubled. But I already filed...What now

I filed electronically in February.   IRS sent me a letter wanting more info on My Cobra tax credits since I was unemployed for 8 months in 2020 and made some Cobra payments out of pocket and I'm eligible for Health Coverage Tax Credit.  I'm in the process of putting that info together today so I bring up TurboTax to look at what I filed and TTax does a software update.  It completes the update and My Federal refund had almost doubled.   We are talking thousands of dollars.  What do I do now?  Seems it would be simpler to cancel the first return and refile with the HCTC info they want, and include the latest TTax return so I get the full, true refund.  I'm sure that is not an option, so what can I do?

 

Thanks you all,

 

Jim