Regarding adding persistence, people in the community are already building solutions, like: https://github.com/ChristianAlexander/durable_object

The good thing about those, IMO, is that they’re leveraging everything that’s already in BEAM/OTP, so there’s no need to reinvent the harder parts. They “only” add some extra features (like persistence of processes/GenServers between restarts) and higher-level abstraction APIs.