You can request an increase to many service quotas by using the console as documented here. Many quotas are not hard limits and can be increased, but not all.
It is possible to request an increase beyond what the service allows - this will be different for each service. Given the scale that you wish to operate at I would strongly recommend two things:
- Automate your deployment solution. At the scale at which you want to operate it will be crucial.
- Start separating your workloads across multiple accounts. Each account has separate quotas and this will help you scale. Automation is going to make operating across multiple accounts much easier.
There are other reasons to use multiple accounts as per this whitepaper.
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