I lost an iPhone 5s a month ago. LOVED that phone. Anyway...out of desperation, I pulled out my ZTE Grand Xmax Plus that has been dead for the better part of 2 years. I had the same issue with the charging port, but mine had actually broken off the piece it was mounted to on the logic board.
I searched eBay, found a logic board for $35 and voila! I'm back in business.
I'm anything but a pro at this stuff, but I figured it out. I'm glad to have this baby back! I feel like Roy Rogers being reunited with Trigger! Lol