Hi,
Thanks for reaching out.
The quota dashboard on the GCP portal mostly highlights the QPS limitations.
We also have backend quota checks that limits the amount of backend machine resources being consumed by a particular account (i.e protect against requests that is expensive to process)
A general solution is to optimize the client-side request.
We can take a look at the request to see the root cause. If interested, please privately share the request body and other account details(such as pub code etc).
Thanks.