[spmurrayzzz]

> Anything in between Amplify and learning all the disparate AWS tools from scratch?

It depends how much of the backend you ultimately would like to avoid (and related to that, how complex your service ecosystem will be for your app).

Without knowing much more about your app, I can throw some darts. You could use RDS to get you postgres/maria/etc and then just run an app server on EC2 for your backend REST/SOAP/etc API in front of that. If the latter body of work isn't comfortable for you, there is a swath of low code tooling out there you could use as well to put an API in front of your SQL for you (nocodb comes to mind, or just postgrest if all you need is CRUD ops).