From what you describe I'm thinking you are running an older versions of QuickBooks Mac 2019 and haven't updated it to the latest version.
Go into your Applications folder and duplicate the QuickBooks Mac 2019 application. This is just to make a backup.
Then launch QuickBooks Mac 2019 and hold down the option key so it won't load your company file. Choose QuickBooks->Check for Updates. My guess is there is one available. Allow it to update. You still have the old one that you duplicated in step one.
Once it updates open your company file from the updated version. My memory is that the latest 2019 version, which is no longer supported, has the log into Intuit machinery disabled. You should be able to open your file and work with it locally. Things like merchant services and online banking are no longer supported and won't work. But if you don't need them then the 2019 version should continue to work on Ventura.
If you need these things you have to update to 2024 and a subscription. If it doesn't work in 2024 then there's some problem with your Intuit log in and likely not the QuickBooks Mac application itself. I could be wrong but that's my guess.
