My issue has been resolved!
Here's what had happened:- I was sent an email regarding 85% usage of my AWS resource for Free Tier. This was a day during the month of June. Right after, I immediately headed to stop all my instances. After that it still didn't seem to have stopped because the dashboard kept showing the updated usage limit which happened to keep increasing day after day. After the month got over, the very next day, on the 1st of July the dashboard cleared out with all instances gone! Wiped away. Cleared. Relief. Finally. Phew!! End of story.
I understand that you launched two instance EC2 and RDS for deployment of your personal website using the Free Tier quota, and even after you stopped both of them you were still charged towards the end of the month.you were also sent 85% usage of your free tier. Please correct me if I misunderstood you.
Please note that while your DB instance is stopped you are charged for provisioned storage (including Provisioned IOPS) and back storage(including manual snapshots and automated backups within your specified retention window), but not for DB instance hours. For more information, see Billing FAQs.
The Free Tier isn't a special mode or type of instance in RDS, it is a credit that is applied at the end of the month if you are within your first year of the account's life. So during normal RDS operation it has no idea if an RDS instance is "free" or not. At the end of the month the billing system applies a credit of up to 750 hours of t2.micro time and 20GB of storage & snapshot storage to the account.
Also, take note that if you chose to have Amazon RDS create a final DB snapshot before it deletes your DB instance, this snapshot might be the one incurring charges. However, you may delete the delete DB snapshots managed by Amazon RDS when you no longer need them.
Further, if you ran an EC2 instance at the beginning of the month but you stopped or terminated it later ,then your bill will include charges for the time that the instance was running. For more information about why you being charged for EC2 when you all instance were terminated refer to this article.
I hope I was able to help, Thank you.
 Amazon RDS FAQs- https://aws.amazon.com/rds/faqs/#billing
 Deleting a DB snapshot- https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_DeleteSnapshot.html
 Why am I being charged for Amazon EC2 when all my instances were terminated?- https://aws.amazon.com/premiumsupport/knowledge-center/ec2-billing-terminated/
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