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"Network Internet Data Transfer Out from Americas to Americas" gradual cost increase

My bill has been increasing by around $200 a month over the past 5 months or so. The main culprit seems to be attributed to "Network Internet Data Transfer Out from Americas to Americas" (the blue bars in the screenshot below).

I was hoping someone could tell me how I can dig into this further and figure out why this is. I know this is based on data transfer so it will vary but the gradual increase resulting in my bill being around $600 more than it was 5 months ago, and this month projected to be higher than it was last month yet again, is a concern.

How can I figure out exactly why there has been such an increase so I can hopefully find a solution to bring it back down?

I, unfortunately, only consider myself a web developer but in my small company I've inherited everything tech related because there is nobody else to. So this stuff is pretty confusing to me. I'm thinking VPC flow logs might be the answer? But I also see that logging also comes with a cost. Is there anyway to figure this out without having to pay for it?

Any insight or direction would be greatly appreciated.

 

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