How can deactivate maximum number of free accounts on my iPhone

You can’t.

See the section “ Three iCloud Accounts Per Device: “ in the article below:

The All Too Common SAD Reality of Buying … - Apple Community

Any one device can create only three iCloud accounts. This is tied to the hardware and there is no way round it. What you can do is to create a new account on another Mac or iOS device (not Windows oe Android), then you will be able to sign into it on the device in question.