How To Change "add To Cart" Button To "request A Quote" Button That Translates Into A Live Forum To Request A Quote.

Please share your experience.

Use language variables https://prnt.sc/s032kq

But, we have the modification "Request a quote".

Not sure that do you mean by "Translates Into A Live Forum". But with the built-in Catalog mode addon you can specify URLs for the Add to cart button (possibly it has another name in this case)