Cell Service Downtown

Looking for input on what carrier works the best downtown. I have Verizon and work in a high rise downtown. Signal is weak, calls drop, and data is <1mbps. I have toggled 5g and 4g modes but they both don't do well. The only decent place is down in the tunnels with a DAS in place. I can hold onto a phone call the whole time down there.

What do other people have and what are your experiences?

Edit: pixel 6 pro