can I get more than 2tb Icloud storage

If you also subscribe to Apple One, you can get up to 4GB of iCloud storage. See the following from What happens to your iCloud storage when you sign up for Apple One - Apple Support

After you subscribe to Apple One, you can buy more iCloud storage if you need more. With both Apple One and an iCloud+ plan, you can have up to 4TB of total iCloud storage.