Are the following true for you: your flash drive is NOT actually PHYSICALLY broken, your your computer can recognize it, your computer assigns it a drive letter? If your answer is yes you can always try flash drive recovery software.
However, software will not work for drives that are not being detected, or recognized. This means you likely have a problem with the controller chip on the device, or a physical problem. In other words it has failed, or become corrupt.
Because of the size of the circuitry and parts, how the device receives power, as well as the difficulty of soldering, unexpected damage is a frequent issue with DIY attempts on these drives. https://www.defensorum.com/ Soldering irons have the potential to burn or melt the printed circuit board, make the recovery much more difficult for a professional, and even cause the drive to be unrecoverable.
Solder can easily be crossed with points on the drive shorting out other components that are required for the drive to communicate with the computer. Another common mistake is when the prongs, or whatever contraption being used to connect the drive to a computer is improperly connected, the memory chips and/or other components can be damaged due to improper power being supplied.