Thank you for your support and extremely happy you are also building a SaaS.

Definitively, there are several ways to build a SaaS product and I also think Cloudflare Workers, FaunaDB, Auth0, Paddle, etc. is a good stack.

One good thing to use AWS, everything is centralized. Another good thing is you can use Infrastructure as code. As a developer, you can provision everything with code (TypeScript), no need to click and remember user interface.