I’m not sure, if Cubase 8 was containing Profile feature already. If yes, export the profile from the File > Profile Manager. Then copy it to the new system and import the profile at the new system to Cubase. This way you can even get profile of an older Cubase version to the latest one.
If Profile Manager is not part of Cubase 8, you can copy the Preferences folder. But not all settings are stored in the preferences folder.
Cubase Preferences folders are:
Mac: ~/Library/Preferences/Cubase X
Win: %appData% Steinberg/Cubase X_64
If you want to migrate your Cubase 8 preferences to Cubase 11 preferences, you would need to rename Cubase 8_64 preferences folder to Cubase 11_64 preferences folder. Cubase 11 doesn’t migrate preferences from Cubase 8.