Lightroom Classic won't launch after I shut down my computer without closing it

Reading through all the actions attempted. One action that is sometimes brought up, and occasionally helps. Does not immediately fix, but can indicate a cause and perhaps a solution. Has not been brought up.

Use your computers Administrative account to log into the computer, not your normal user account. This is not a normal recommended practice, but it might indicate a account issue on the computer. Does LrC start if you use the Admin account?

Some might call for you to log into the computer in Safe Mode, I have no idea how to do that on a MAC. Safe mode will start a computer with the bare bones minimum running, in case some bit of software, a driver, an applet, is hiding things up.

Some reference material:

https://helpx.adobe.com/lightroom-classic/kb/lightroom-basic-troubleshooting-fix-most-issues.html

https://helpx.adobe.com/lightroom-classic/help/allow-permissions.html

https://helpx.adobe.com/lightroom-classic/help/allow-permissions.html

And some links about Catalogs:

Adobe: Create and manage catalogs

Adobe: How Lightroom Classic catalogs work

Adobe: Lightroom Classic catalog FAQ

Adobe: Preference file and other file locations | Lightroom Classic

Well, you have a fine mess. With the Adobe install, your Adobe uninstall, your File Structure.

At any rate, reading back, you have:

• Uninstalled, re-installed (chose to delete preferences)
• Signed out of Adobe CC, signed back in
• Installed earlier versions
• Held down Option + Shift while launching and hit "Reset Preferences"
• Manually deleted all Lightroom catalog, backup, and photo files I could find on my hard drive
• I tried to follow Adobes guide to deleting preferences manually by deleting the file "com.adobe.LightroomClassicCC7.plist" but it does not exist on my computer. I went to the preferences folder and it isn't there. I search it on Finder and nothing comes up.
• Tried updating my computer to the latest Mac OS  version, restarting my computer etc.
• Tried your suggestion below about holding down the option key while launching

I will hope that a knowledgeable MACOS user/member can help with your File structure. And with understanding the different MAC Root hard drive. But I am off issue with that.

At this time, it may be necessary to properly remove the Adobe programs. This involved a small app from Adobe, a procedure. Using the MACOS to uninstall is not sufficient. Using the Adobe Creative Cloud Desktop App yo simply uninstall is not sufficient when the Adobe Apps get so so fouled up. You may also need to uninstall the Adobe Creative Cloud Desktop App (separate procedure).

After you fully uninstall the apps and the Adobe Creative Cloud Desktop App. You would then reinstall a fresh new copy of the Adobe Creative Cloud Desktop App, and then the individual apps, starting with Photoshop (make sure you install PS first, before LrC, some odd issue on MACOS)

First the Adobe Creative Cloud Cleaner Tool:

https://helpx.adobe.com/creative-cloud/kb/cc-cleaner-tool-installation-problems.html

then the Adobe CC Desktop APP:

https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html

Assuming United States Market, the Adobe CC Desktop App download/install:

https://www.adobe.com/creativecloud/desktop-app.html

And something to try out, this as to prevent any confusion by LrC as to what catalog to open, and to force LrC to create a new catalog. On that MAC press and hold down the OPTION key, and click on the LrC startup icon. Hopefully this should bring up a Select Catalog screen, where you can select New Catalog.

Not sure if this occurs before or after LrC reads the preference file. (should the preference file still be corrupt)

A bit confused, you stated you deleted all the LrC catalog and related files, but then you looked for and deleted two lock files. Where those in a new catalog?

Please use your MACOS Finder, to navigate to where that catalog is or is not (as in would have been) and post a screenshot of that folder and contents.

Have you added many photos to your Lightroom Classic catalog since updating from V 12.x?

Try reverting LrC V 13.0.1 back to V 13.0. In the Creative Cloud App, on the Lightroom Classic line, click on the three dots at the right end. From there click on "Other Versions" and choose V 13.0.

Here is a link to resetting LrC Preferences.

Restarted again and now the creative cloud interface is fine but Lightroom Classic still won't open

I did this. It still won't launch. And now my Creative Cloud interface is acting up too (see attached screenshot). I'm so frustrated........

I would try uninstalling and reinstalling through the Adobe Creative Cloud app. Unintall, restart your system, then reinstall Lightroom Classic. 

I deleted two Lightroom files that ended in .lock and Lightroom Classic still won't open. Any other ideas? Thanks very much.