I would seriously consider SailfishOS if it shipped on decent (recent) hardware that was available in the US. The last good experience I had with it was on the Xperia XA2, but that hardware was turned into ewaste by the VoLTE requirements of US carriers. Although they claim to run on more recent Xperia phones, they don't have full hardware support, and aren't on the most recent models. If I'm going to pay for a phone OS and hardware to support it, I want some assurance it won't be total jank.
I have been using Xperia 10 III as my main phone for years with Sailfish OS just fine.
Looks like they also support up to Xperia 10 V & there is the Jolla C2 community device:
I think you can install it on Xperia X 10 III, and IV (which I have) is in a long-toothed beta.
Well you'll need to talk to your monopolistic carriers then. US mobile innovation is dead for the foreseeable future due to them, all new innovation is happening in China and other SE Asian markets.
You just need to be a good consumer and buy that iPhone that Verizon orders you to have with their blessing.