Glad that you can successfully unlock bootloader for your Hipad Pro.
fastboot flashing critical_unlock
I had 3 Mediatek devices: 1.Teclast M30 Pro 2.Teclast T30 3.Alldocube iPlay 30 Pro
All of them can be unlocked bootloader easily. Unisoc devices are a bit harder to unlock by using Hovatek tool. I had Alldocube iPlay 20 Pro and Teclast M40. Used their tool to unlock bootloader. Most Qualcomm devices require more specific methods to unlock bootloader. Mostly the unlock tools have to be developed by their own manufacturers. And may vary depending on each variant edition of the device models. Quite sophitcated to unlock Qualcomm devices.
Anyways congratulation! you can try root your device or flash GSI ROM that suits your favors. I explain how to flash GSI ROM here. There are many GSI ROMs that you can google on the internet.