SANDISK 128GB Phone Drive for iPhone - USB-C and Lightning - Compatible with iPhones, iPads, Mac, and USB-C Devices - Made for iPhone Certified - Metallic Blue Finish - SDIXD0N-128G-GN6N

Disable automatic updates/downloads and enabled ‘offload unused apps’. Then reboot the iPad and it should clean up in a day or so. Also look at other apps you have like YouTube. Sometimes they can get bloated and you need to delete the app and re-install. If you still don’t have enough space then backup the iPad, erase all content and settings and restore. You can also get lightning thumb drives or a lightning to microsd adapter. Then can copy files on to the drive to offload from the iPad. Make sure you also keep another copy on a computer since thumb drives /sd cards can get corrupted: https://a.co/d/08MujvqD https://a.co/d/00cemuyf