How to upgrade my zoho account to have new features?

How to upgrade my zoho account to have new features?

We have been waiting for user permissions and some other features that i just found out are already integrated but only in new zoho accounts!

How can I upgrade my zoho account to have these features? Do i need to cancel my entire account and attempt a migration?  How can I get these needed features?

I wanted to use customer portal but its mostly useless to us if we do not have access to user permissions.

Please help me here.
Thanks