How can I stop missed and failed calls with Verizon in a rural area?

I bought an iPhone 17 Pro Max with Verizon service in January, and almost immediately started having call problems at home. Outgoing calls often show "Call Failure" and require two or three attempts before connecting. I've also discovered that some incoming calls never appear in my missed-call history, even though the caller says they reached voicemail. This is becoming a serious problem because I work in sales and can't reliably miss calls without knowing it. Verizon has already had me reset my network settings, change to the Unlimited Ultimate plan, and replace the phone under warranty, but none of that helped. At home, the phone usually shows two bars of 5G UW. Verizon's map says the area has 5G coverage, although it's rural and close to areas served by 4G LTE. The field test menu shows an RSRP around -112 dBm. My husband has the same phone and carrier, and his calls generally work, though most are from nearby callers. Could the weak signal or the type and distance of the caller be causing this? Would Wi-Fi Calling, a better home Wi-Fi setup, or a cellular signal booster such as a WeBoost be worth trying?