Sorry to hear about this issue. Please try following these steps one by one and let us know how it goes:
Rename CEP folder from /Library/Application Support/Adobe to CEP.old
If that doesn't help, rename extensions folder from /Library/Application Support/Adobe/UXP to extensions.old
If that doesn't help either, uninstall the application using Cleaner tool (https://helpx.adobe.com/in/creative-cloud/kb/cc-cleaner-tool-installation-problems.html) and reinstall from the Creative Clou...
Reset Your Prefs (quick) Press and hold the 3 modifier keys as you start Illustrator. The new preferences files are created the next time you start Illustrator. Alt+Control+Shift (Windows) Option+Command+Shift (macOS)
Reset Your Prefs (Mac - more thorough) Quit Illustrator. Finder >> Go (hold down option to show hidden) >> library Preferences>> Adobe Illustrator 24 Settings (rename to Illustrator 24 Settings folder.old) Preferences >> Adobe >>Adobe Illustrator (rename to Adobe Illustrator.old) Library- >> Caches >> com.adobe.illustrator (rename to com.adobe.illustrator.old) Library >> Application Support >> Adobe >> Adobe Illustrator 24 (rename to Adobe Illustrator 24.old)