Lineageos is still here, GrapheneOS and CalyxOS is more updated and presumably more secure and private, but Graphene only supports Pixels and Calyx supports Pixels plus some other models. Pixels should be your best bet in terms of ROM compatibility.
It sucks. There's basically no other choice except a Pixel phone. And even some of them are locked if you buy it through your carrier.
I would get some Linux phone even if they aren't perfect, but I have no cell reception, and rely on Wifi calling, which seems to be some proprietary thing that only Apple and Google are able to implement.
