Turn off the iPhone
Unplug the charger and remove any accessories
Inspect the charging port with a light
Use a dry, soft, anti-static brush to loosen debris
Gently tap the iPhone port-side down to dislodge loose lint
Use a wooden or plastic toothpick very carefully if needed
Avoid metal tools, liquids, and compressed air
Clean the charging cable connector as well
Let the port dry completely if any moisture is present
Reconnect the charger and test charging
Seek professional help if the port is damaged or still not working