Experience with Google CASA Tier 3?

I had a great idea! I gambled big and hired a dev team. They built the app, and handed it over to us (deployed on Vercel)
Since we are a signed Google Partner, we wanted to standardize on GCP, and we did.

The app requires the full .drive scope, which of course google does not take lightly. They scheduled us for a tier THREE CASA... we were betting on Tier 2, nope.

Anyone have experience or helpful tips on navigating / preparing for this?