10K Requests Per Second Handling Architecture

Hi,

Let's suppose I have a static server containing .html/.css/.js for static website along with this we have data of users like images/json-files which links to a signed in users and users can access their own created/modified files only.

To achieve the above use case I assume following the ideal structure to serve the static content as well as apply some logic to decided users authorization on a certain file access

Architecture:
All data to be stored in a S3 bucket and add a server in front of bucket which will decide the requesting files authorization and allows the access or deny it for a certain logged in user

Challenge:
The Linode S3 Bucket can handle only 750 requests per second which I think is too low count in our app case, I can optimise the requests count but still it's too low

How to handle like 10k requests per second using using Linode S3 bucket? Do I need to install more compute instances to calculate authorization of files requesting? I probably need to install load-balancer too on top of computer instances.

In general I would like to know if (S3 + Requests Authorization Compute Instances + load balancer) is ideal solution for my case where it needs to cater 10k or more requests per second? OR is there a better design to handle this case?

Thanks