Multiple crashes

If Creative Cloud crashes constantly, that implies you have a system problem.  Or your computer is not powerful enough to support the load.

Please ensure your computer exceeds the minimum system requirements to run Creative Cloud + OS + all other apps you use. Check each one.  
- https://helpx.adobe.com/creative-cloud/system-requirements.html

If problems began with Big Sur, maybe you should revert back to your old operating system.  See link below.

https://www.macworld.co.uk/how-to/downgrade-macos-3581872/

first, reset the cc app:

to reset the cc desktop app, make sure it's in the foreground, then press:

Win: Ctrl + Alt + R
Mac: Cmd + Opt + R

if that fails, try to repair
https://helpx.adobe.com/download-install/kb/creative-cloud-install-stuck.html

if that fails go ahead and uninstall/reinstall per the above link

if that fails, do a clean cc install following each applicable step:

uninstall every cc app including preferences, https://helpx.adobe.com/creative-cloud/help/uninstall-remove-app.html
then uninstall the cc desktop app, https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html
clean your computer of cc files per http://www.adobe.com/support/contact/cscleanertool.html
check for, and if available, update your os
restart your computer (don't skip this)
reinstall the cc desktop app, https://helpx.adobe.com/uk/download-install/kb/creative-cloud-desktop-app-download.html
if you're unable to install the cc desktop app at this stage, use the link at the bottom of the page at https://helpx.adobe.com/uk/download-install/kb/creative-cloud-desktop-app-download.html
use the desktop app to install your cc programs/trials