Is there a way I can ‘unwatch’ all topics I’m currently watching? I just want to be notified if I’m tagged going forward.
As staff you can use the bulk tool, head to your profile, then go to watched categories and click here to see the list:
Then select the topics
Click the wrench
And change notifications to normal.
how can a regular user do this?
No unfortunately not, regular users do not have access to bulk tools.