If calibrating the drone does not restore the GPS, try replacing the module. I made a detailed video tutorial here DJI Mini 3 Pro GPS Module Replacement
Hi, the process of restoring a water damaged controller you can watch in this video https://youtu.be/OUNQgyGQfh8 The video shows how to repair the DualSense controller, but for a correct understanding of how to do this in the case of a Dualshock, it will be quite clear. To successfully repair, you will need isopropyl alcohol and a screwdriver-type PH0.
If your PC does not detect your drone in the device manager, most likely your PC did not find drivers for your drone, download and install DJI Assistant for your drone model.