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I suggest looking into Amazon Aurora: its storage paradigm removes the need for pre-provisioning storage size and the price you pay for the stored data can go down if you're storing less.
Which level of support do you have? If you have Developer or Business then open a support case and ask for this as a Request For Enhancement, and if you have Enterprise support then engage an Account Manager.
If you don't have any of them then this forum is the best option, AWS staff regularly look in on this and contribute, so one of them may take this on for you. it may help to make it more prominent by putting [FEATURE REQUEST] in the title of your question.
This third-party blog goes through all of the options in much more detail https://cloudar.be/awsblog/tips-for-making-aws-feature-requests/
My gut feel is that this won't come to anything - it's pretty clear that there's been a decision that storage can only be increased and never decreased - but no harm in asking.
https://repost.aws/knowledge-center/rds-db-storage-size
you can't modify the allocated storage size of the DB instance to decrease the total storage
You can't reduce the amount of storage for a DB instance
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Aurora resources are more expensive than RDS even with reduced storage consumption, see this AWS pricing example:
https://calculator.aws/#/estimate?id=edb83cc5c4dc170d387236bd9f46ee20a02a7c35