Replacing a charging port on an iPod touch 4th gen or later is a standard repair done by any cell phone shop that microsolders. You could probably attempt it as DIY, or just send your ipod out to have it done and your device will be back on the road. Remember, the Apple store does not do repair, only replace. This isn't the kind of thing that they can help you with, however it is done all day every day by reputable repair shops.