Hi I have been trying to restart my iPhone because i forgot my passcode and i tried those steps and still it's not restarting nor working! As well as it is not connecting to my laptop (macBook Air). what should I do?!

Connect iPhone to Mac

Use your USB lightening cable --> Resolve USB-related alerts in iTunes - Apple Support

If unable to connect --> If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support

For your Mac --> If your computer doesn't recognize your iPhone, iPad, or iPod ...

Use genuine cable --> Identify counterfeit or uncertified Lightning connector accessories ...

See how to --> Sync your iPhone, iPad, or iPod using iTunes on your computer ...

To reset the passcode -> If you forgot the passcode for your iPhone, iPad, or iPod touch, or your ...

Learn how to--> Update your iPhone, iPad, or iPod touch - Apple Support

Here is the process to --> Backup on iTunes.

If you are experiencing an issue not listed here, contact support

If you see an iPhone or iPad unavailable message or Security Lockout screen

If you forgot your passcode, you can use your Apple ID and password to erase and reset your device without a computer.

Before you reset your device

• You need to have a device that's using iOS 15.2 or iPadOS 15.2 or later.
• Your iPhone, iPad, or iPod touch needs to be connected to a cellular or Wi-Fi network.*
• You'll need your Apple ID and password that you used to set up your device.

* If you restart your device when you see "Security Lockout" on the Lock Screen, you won't be able to reconnect to a Wi-Fi network until your device is unlocked. Cellular devices will reconnect to a cellular network if you have active service.

If you enter the wrong passcode on your iPhone Lock Screen too many times, an alert lets you know that your iPhone is disabled. (Learn what to do if you see "[Device] unavailable" or "Security Lockout" on your iPhone or iPad.)

Ask one question at a time and clearly explain what you have tried.