Are you surprised by your AWS monthly-bill? And are unsure where the costs are coming from. You should visit AWS Cost Explorer and check the billing breakdown and identify the cost bottleneck and then take a look at optimization opportunities to reduce the bottleneck costs. For example: If the bottleneck is EC2 then you may benefit from the use of reserved instances to lower costs.
Under this solution an AWS Certified Solutions Architect will sit together over a 2-hour call on screen-share and discuss the reason behind your unexpected AWS bill and uncover optimization opportunities and work together on the call to form a plan to reduce the costs. We may utilize tools such as AWS Billing and Cost Explorer.