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). The new storage limit is applied the next time a user accesses OneDrive.

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. To discuss your needs, contact Microsoft support. With over 51 of all organizations in the US and Europe relying on it to store important business information, securing OneDrive data is now more critical than ever. 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. OneDrive for business is a cloud storage platform that is available as a part of the Microsoft 365 productivity bundle. Set the default storage space for OneDrive users Please see the following documentation for more information:

Onedrive for business cost