Sorry for your experience, but we need a bunch more information from you to be able to help.
You say you're working with an iMac. What model iMac? Intel or Silicon M1 processor? How much RAM? You say 12.3 — I assume that's your MacOS version? Did you just update to the latest version of Monterey? Did InDesign and Creative Cloud work before you did the upgrade? What version(s) of Creative Cloud and InDesign are you using? Do other Creative Cloud apps have the same issues? Do other programs on your system have the same issues?
Most importantly, do you have a backup of your previous OS install before you did the upgrade?
We're happy to help as we can, but we're going to need a lot more information before we can help you.
Cool. So, hopefully, the immediate good news is that you can roll back and get back where you were before the upgrade and the damage. That makes this more an irritant than a crisis. A real miserable irritant, of course, but nothing that can't be overcome.
While I haven't heard about many issues with CC and InDesign specifically over the latest MacOS Monterey upgrade, there have been several rude surprises that have come from the upgrade. It's cold comfort that at least you haven't experienced the worst of them (bricked systems, UI lags, etc.) but even if you don't have a complete OS backup, it's not insurmountable.
You can find more information on Monterey 12.3 update issues and how to rollback your OS install here: