We did the same thing (very small company, but outsized cloud hosting costs due to the nature of our business), and frankly the biggest cost savings for us was

We did the same thing (very small company, but outsized cloud hosting costs due to the nature of our business), and frankly the biggest cost savings for us was shifting some resources off AWS and to other providers. For us, Cloudfront was a massive expense that is without exagerration an order of magnitude more expensive than other providers, and even in the world of AWS custom pricing, it's a struggle to get cloudfront costs down to even the retail offering of other providers.