You should never move just to move. Postgres has an incredibly long scalability curve just on a single server or small cluster, and after you outgrow that, you

You should never move just to move. Postgres has an incredibly long scalability curve just on a single server or small cluster, and after you outgrow that, you can move to something clustered that's PG-compatible, either self-hosted or cloud, like CockroachDB, Citus, or a cloud DB like AWS Redshift. Whatever you do, don't lift-and-shift just for the fun of it (or to pump up your resume!) Unless you are facing extreme variability (changes) in your workload (i.e., growing by 20% per week or something like that), you should probably stay where you are. There's absolutely nothing wrong with stable, predictable organic growth.