Do you work in IT? Do you support a system? Do you work on a helpdesk? Do you take calls, answer emails?
Congratulations. That's no longer your job title. From the moment you read this, you're a user advocate.
Process issue holding something up? Bug in the app? Is a particular system always down? Advocate for your users. Go to bat for them with the teams responsible for their struggles.
Folks will say "oh thank christ, it's you" when they hear your voice on the phone if you advocate for them.