That is incorrect that ethernet has a maximum of 100 feet. It has a maximum of 328 feet or 100 meters from computer to hub, switch or bridge. Yes, you could use a hub, switch, or bridge as a repeater to extend it to 656 feet or 200 meters.
From the bad connector, cut about 6 inches or 15 centimeters. Then crimp a new connector. Do the same to the other end of the cable if it still does not work. If it still does not work, you have to replace the whole cable.