If that does not help, then it could be your catalog. Rename the catalog file or (temporarily) move it out of the catalog folder, so Lightroom can't find it. If you get a dialog to search for it, create a new catalog to see if that works.
At the risk of sounding silly, have you tried rebooting the computer? Sometimes Mac OS gets in a state where it won't launch apps. Rebooting will fix that. If that doesn't help and apparently resetting preferences didn't help, try starting with the option key held. It should throw a dialog where you can choose a catalog file and can repair your catalog.
Probably reinstall time then. This might be a broken Lightroom installation which is rare. I would uninstall first and then reinstall classic. You might have to repoint it at your catalog after the reinstallation.
In that case it will take some deeper digging. I would look for messages in the system log file (open by typing console in the looking glass icon in the menu bar). Look for crash logs there for classic. If you don't see any, start streaming the system log and see what happens when you try to open Classic. I also see OneDrive in your icons there. Make sure your catalog is not in a OneDrive (or any other cloud service) managed location. This can severely damage your catalogs.
If you are migrating from an older version of the OS, it may not work properly if settings remain. When installing the app, please install it from the desktop app. Additionally, creating a new OS user and reinstalling the app may also improve the issue.
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