iPad Not connecting to MacBook Air via USB

I have a 6th generation iPad, and a Macbook Air late 2015. Up until today, I've had minor issues connecting it via USB (such as the charge cutting in and out), but nothing I haven't been able to get by. Today, my iPad is not connecting at all. So when I plug in my iPad to my Mac via USB, nothing happens. It is not charging nor is it connected. I cannot mirror it via iMovie or zoom. I have tried the following: Many different USB wires (They all connect my phone no problem, but not my iPad) Cleaning the charging port with a toothpick. Restarting both devices. Also do note: if I plug my iPad into the wall, it charges immediately. I don't need my iPad to charge, I just need it to be connected so I can mirror it. This is extremely important for my job. Does anyone have any advice? Thanks!