Try installing this OpenSignal app:
https://forums.androidcentral.com/e?...token=Cvruksfi
It's primarily a speed test utility but it also includes a handy mapping feature where you can locate nearby cell towers and see coverage range for the major carriers. The accumulated data is crowd-sourced so the good part is you get actual usage info (not marketing babble from the carriers) but the bad part if you live in more remote area it's a lot less useful (not enough data to analyze and process).
Perhaps Verizon just doesn't want to invest in supporting your vicinity. The big carriers are very territorial and opt to isolate their cellular networks from each other so hopefully a different carrier will have better coverage in your locale. Straight Talk has contracts with AT&T, T-Mobile, along with Verizon so switching is more or less just a matter of contacting them about your choice so they can send you a new SIM card.