Why do you need a tag for users finding all your topics in one place?
All topics can be found in your user activity.
You can also search for topics by a specific user [e.g. https://meta.discourse.org/search?q=%40alltiagocom%20in%3Afirst%20%23support] or filter the topic list for those [e.g. https://meta.discourse.org/filter?q=category%3Asupport%20%20created-by%3Aalltiagocom].
Depending on the general use of the category, the User Portfolio component is also a way to highlight topics created.