Apple Charger's keep breaking for iPhone

in the past year I’ve gone through 3 different apple chargers and they all keep breaking. They show no visible signs of damage they just stop working. I’ve tried cleaning the charging port, flipping the direction of the charger and everything else. All my apple devices work with my sisters charger so I know my devices aren’t broken. How do I fix this, and prevent it from happening agai?

[Re-Titled by Moderator]