
Hello,
Please see the following documentation for more information:
Set the default storage space for OneDrive users
https://learn.microsoft.com/en-us/sharepoint/set-default-storage-space
If your organization has a qualifying Microsoft 365 subscription and five (5) or more users, you can change the storage space to more than 5 TB. To discuss your needs, contact Microsoft support. Before requesting an increase you need at least five licenses that include OneDrive Plan 2, you must assign at least one license to a user, and a single user must have already filled 90% of their 5 TB storage. The new storage limit is applied the next time a user accesses OneDrive.
In accordance to the document, you can raise your limit from 1 TB to 5 TB (no price is mentioned, meaning if you meet the requirements, you will get the raised limit).
If you do not see the option I'd recommend you raise a ticket in Microsoft 365 Admin Center:
https://learn.microsoft.com/en-us/microsoft-365/admin/get-help-support?view=o365-worldwide
If this is helpful please accept answer.