We're in the middle of a similar transition, except that we were using the realtime features of firebase (but we needed better querying).
We've found that Hasura offers us the best of both worlds. It doesn't actually store any data itself, it's "just" an API layer on top of postgres. So we can do most things with bog-standard SQL-backed REST APIs, and with a couple of clicks to set up relations and permissions in Hasura we also access any of that same data through realtime-capable GraphQL api.
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We're in the middle of a similar transition, except that we were using the realtime features of firebase (but we needed better querying).
We've found that Hasura offers us the best of both worlds. It doesn't actually store any data itself, it's "just" an API layer on top of postgres. So we can do most things with bog-standard SQL-backed REST APIs, and with a couple of clicks to set up relations and permissions in Hasura we also access any of that same data through realtime-capable GraphQL api.