How to create a Default Argument based on Tags
At first glance I think you should create a taxonomy view with relationship to the content type where it was use by the user, then create a contextual filter to filter the nodes where the user is the author.

I am not sure if the tags created by the user will get the uid of the user that created out of the box, but if you can control that then the view will be even simpler just a taxonomy view with a contextual filter to the field holding the uid by the login user.