You can only remove static IP via MyAccount if you do not wish to have it anymore.
Note: $51 static IP cancellation fee will apply if you cancel your Static IP within 1 year of activation
Here's how you can remove your static IP
Log in to Your MyAccount > Select "Managed Add-on" > Click "Static IP' > Select "Terminate Static IP"
In view of the Goods and Services Tax (GST) rate increase from 7% to 8%, there will be slight adjustment in the stated prices if your charge(s) is/ are incurred from 1 January 2023.