iphone 6 is disabled. Cannot do anything. please help

If you forgot the passcode on your iPhone, or your iPhone is disabled or unavailable -

How to reset your passcode without a computer if you have iOS 15.2 or higher.

How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support

How to reset your passcode using a computer.

If you forgot your iPhone passcode - Apple Support

Did you follow the steps in the article above your original post? It is linked again just below:

If you forgot your iPhone passcode - Apple Support

Hopefully, you have a recent backup of the phone that you can use to restore the phone, once it has been erased and reset.