Yes; it is very helpful that you premised this thread with what you did before the problem began. Many don't. Maybe they do not remember or do not think it was important.
Permissions are a critical thing and must be exercised with caution. Especially if the recursive flag (`-R) is used.
I saw above that you included a :users permission, as well... I wish I knew a "Restore all permissions to default" command that was simple. Sadly, we would really need to know each change you made - than trace it backward undoing each one in order to be thorough.
Your best bet is to reinstall Zorin OS. As daunting as that sounds, please first see this thread to see if you can make things less daunting.