The End of Groovy Has Arrived

Sorry, is this the end of groovy that’s shutting down my smartapps?
if I try to reactivate them, the lever disappears and when the Smartthings app is opened again, the levers are down. If I try to enter each one and save, it gives me a network error…

Yes, the SmartThings cloud is no longer available for custom SmartApps (ones that you added yourself through the old IDE).

New community FAQ:

Why Did My Integration/SmartApp Stop Working in January 2023?