I think that if you honestly consider GraphQL a better fit than gRPC, you probably should never have considered gRPC to begin with...
And much as we're considering GraphQL for some services as work... I'm not sure I buy it as an RPC framework. I suppose it has about the same appeal as SOAP for that purpose.
Here's an article making the argument for it https://blog.spaceuptech.com/posts/why-we-moved-from-grpc-to...