I have corrected mine in the past but I sure can’t recall how I did it.

I do think I did it right from the texting screen, though.

I’m not the guy to ask but I have a suggestion for some of the guys that might know?

What if you break out the current brick floor internally to the current walls, then prep and pour a good concrete foundation.

Then you could build 2x4 wall structures inside what’s already there and insulate in between?