Handling Bugs and Resolutions

Hello everyone, I am a Product Specialist and working under a PM. Recently, they have been assigning all bug-related issues to me. Unfortunately, we do not have a designated QA, so all testing is done through the PM and me. I come from a non-technical background, and learning to navigate this role since we have to wear different hats. Lately, a few users have been CC'ing higher-ups because something is broken and they want a fix immediately. We already have a backlog of items and try to work on 2-3 bugs per sprint (and will pick up additional items along the way depending on urgency) as we are working towards sunsetting soon.

What are some ways that I can handle this?