You have a working GA implementation via GTM.
You're consuming your data regularly, using it to make business decisions large and small.
Now Google says you have just over a year to migrate to a new tool - GA4.
Compare Universal Analytics hits to corresponding GA4 hits COMING SOON
Compare values in custom dimensions for Universal Analytics vs GA4 COMING SOON
Compare goal definitions COMING SOON
Get acquainted with Intarsia's workspace view to see how your data and web properties map together and confirm you've tagged everything that needs tagging