Hi, I'm John! I will help you with this.
When a OneDrive account goes over the storage limit, it becomes frozen, and that prevents you from managing your files. To fix this, the first step is to unfreeze your account, and Microsoft explains the process here: "What does it mean when your OneDrive account is frozen?" https://support.microsoft.com/office/what-does-it-mean-when-your-onedrive-account-is-frozen-5e76147b-b7d5-4bcb-ba28-b91e3eb636b6
After freeing space (or purchasing additional storage), it can take up to 24 to 48 hours for everything to fully update across your account. I’d recommend waiting until then.
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Regards,
John J.D.