Allow find command to access my files
There are two things you should do:


Enable full Terminal access by opening System Preferences, selecting the Security Tab, selecting the last tab there, selecting Full Disk Access on the left and adding Terminal.app





Run the command as

sudo find / -name "file_name"





Assuming the file you are looking for is within your home folder

find ~ -name "file_name"


should also work (and is significantly faster).