storage on sharepoint Online Increase or office 365 sharepoint Storage issue

Storage on sharepoint Online Increase or office 365 sharepoint Storage issue :

If you notice that the storage for your SharePoint sites is running out of pace in Online, you can add storage to your subscription if your plan is eligible. If you don't see the Office 365 Extra File Storage in the list of available add-ons, it means your plan is not eligible. 

Buy the extra storage add-on

If you haven't yet bought extra storage for your subscription, you can do that.

1. In the admin center, go to the Billing > Purchase services page.
2. At the bottom of the Purchase services page, in the Add-ons section, find Office 365 Extra File Storage, and select Details.
3. On the product details page, select Next.
4. If needed, choose the base subscription, then enter the number of gigabytes of storage you want to add.
5. Select Check out now.
6. On the How does this look? page, verify the number of gigabytes of storage you selected, review the pricing information, and then select Next.
7. On the Complete order page, verify the total. If you need to make any changes, select Edit order. If the order requires a credit check, select the check box. When you're finished, select Place order > Go to Admin Home.

Increase or decrease your extra storage:

If you've already bought extra file storage via the Office 365 Extra File Storage add-on, you can use these steps to increase or decrease the extra storage space for your subscription. You can reduce the storage to as low as 1 gigabyte. To remove all of the extra storage space, contact support.

1. In the admin center, go to the Billing > Your products page.
2. On the Products tab, select the subscription that contains the Office 365 Extra File Storage add-on.
3. On the product details page, in the Add-ons section, select Manage add-ons.
4. In the Manage add-ons pane, from the Add-on list, choose Office 365 Extra File Storage.
5. In the Quantity text box, enter the number of GBs of storage space that you want for the subscription.
6. Select Save.

Reference Article : https://learn.microsoft.com/en-us/microsoft-365/commerce/add-storage-space?view=o365-worldwide

I hope the above information will help you to resolve the issue, in case of any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you.