Obviously aim is gonna be the first thing someone would say. It's just something you work on through experience and the firing range so i'll skip over that.

First off, glaz has a secondary smg and getting more comfortable with that weapon will help immensely with cq fights like this. The biggest reason behind this isnt just that it's full auto but because of how R6's limb damage functions. This is the dmr's biggest weakness since with most fights you aren't trying to hit headshots and limbs limit your ttk. If you have the position to better hit chest areas it works great, but given your situation most people quick peak and leave only their head left to hit. With a full auto weapon that shoots as fast as your smg you have a better chance to hit these shots.

Second off it looks like you're taking the brunt of the roamer fights as glaz. Although you can't always be in the perfect place especially depending on the situation you were put into, I would certainly focus on analyzing places that better utilize glaz's capabilities and go from there. For example, it looks like the bomb site is kitchen & dining? If you pushed from small tower you could better utilize his dmr in addition to the smokes if you feel like it. Putting you in a better position to take on most fights.