Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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You are only eligible for a full refund if you cancel your Office 365 subscription within 30 days of purchase. Since it has already been 6 months, if you cancel it now, you will no longer be eligible for a refund.
A few important points to note:
If you switch to a perpetual license, your OneDrive and Outlook email storage will be reduced from 1 TB to 5 GB for OneDrive and 15 GB for Outlook email.
If you have already exceeded these limits, make sure you back up your files or attachments to your local drive and then free up space in your cloud storage.
You can check the limits by signing in with your account here -
https://outlook.live.com/mail/0/options/accounts-category/storage
Also, with the Office 2024 perpetual license, you will only get the Office apps: Word, Excel, PowerPoint, and OneNote.
Therefore, my recommendation is to continue using your Office 365 subscription until just before it automatically renews. You can then cancel the subscription and start using the Office 2024 edition.