my iPhone will not charge

Did you try a new charger? a new cable? flip that cable 180 degrees and insert again?

Have you tried a wireless charger? Or if you normally use a wireless charger, have you tried a different wireless charger?

Have you restarted your iPhone?

Force restart iPhone - Apple Support

If still having trouble, and you are unable to charge with the lightning port..

grab a flashlight and look up into the port. See any debris?

If so, power down the iPhone, grab something non-metallic such as a wooden toothpick (might have to shave it down so it fits)

Then carefully clear out any obstructions