6 phones later we are dealing with the same issue. Little to No 4G LTE signal at home. It flaps from 1 bar to 0 bars. However if I switch to 3G I get good service. 3G is the only way I can make a voice call. Next, when I drive down the street I get poor 3G service and have to switch back to 4LTE. If I forget to switch back and make a voice call - it sounds nasty and distorted. Having to remember to switch back and forth from being at home to being away from home is the worst. I have tried many phones but they all do the same thing. Currently my wife and I are using iPhone 8s with iOS v13.3.1. Zip code 23666.
We know how important it is to stay connected! Does this only happen inside of your home? Are you using Wi-Fi Calling while in your home?