My iPad won't charge

So my iPad won't charge. When I first bought it (used) it had some charging issues but after some time it worked fine. I sometimes had to turn the Cable because it didn't charge. But now it completely stopped charging. If I connect the charger it does nothing, if i turn it off and connect it, it boots automatically and a message pops up saying "Accessory connected" but it still wont charge. The Port is clean and I've tried many different Cables, including the original one.

About the "Accessory connected" Message, my iPad 7 keeps getting the same message but charges perfectly fine.