There is no option to downgrade in Member Zone. You can contact us by SMS email ticket or phone in order to downgrade.
When downgrading from Unlimited hosting plan to Ultra hosting, you would not need to republish your files. However, if you are downgrading to Basic hosting, you would need to republish your files as we need to move you to a different server.
If your hosting plan still has term remaining (ie. Your renewal date for Unlimited hosting is 4 months away) the remaining paid term is given back to you as pro-rated in-store credits.