Why has my service gotten worse since the switch to 5G?

I’ve been a Verizon customer since 1999 and I e stayed with Verizon because of their coverage. Never had any issues. Now since the 5G switch, it takes forever to load anything. Ive purchased new devices and live in the Denver metro area so it’s not like I live in the sticks. 
I have friends that have 5G service with ATT and they never have connection issues. Maybe it’s time for a switch. 
horrible coverage for the price I pay per month!!!