How can I get Apple TV + free

As DistrictX mentioned, if you are already a subscriber (even with a free trial version) you cannot commence another free trial.

If this does not apply to you, then set up your free trial withtv+ Get 3 months of Apple TV+ for free and check your eligibility.

This page advises: Your 3 months free of Apple TV+ is included when you buy a new iPhone, iPad, iPod touch, Apple TV, or Mac from Apple or an Apple-authorized reseller. Your new device must also be capable of running the latest iOS, iPadOS, tvOS, or macOS.

Hi. Did you subscribe the Apple TV plus before or started the 7 days free trial?