A component within the charging port may have broken but assuming not you can try cleaning out the port with some 99.9% isopropyl alcohol (this is a liquid that is safe to use on electronics).
First turn off the device then put some isopropyl alcohol in the port to try to remove any debris (you can repeat if needed) if you own anything soft that you could move around in the port like a form of plastic (don't use metal) use that to aid removal of debris.
This method will only work if the port is dirty and the pins aren't contacting as a result. Usually the charging port will charge on/off in these cases.