The billing report in AWS only displays expenditure during the current month. For this month, the three main causes of expense have been the services; RDS, EC2, and KMS.
More detailed billing logs for each service are shown below.
When input into my AWS spreadsheet, I get the following results:
The percentage growth between this budget update and the last one has dropped, which is indicative of me reaching the end of the DinoStore project and hence, using those services less frequently.