You don't need to use SoftwareSerial because the Nano 33 IOT has more than one hardware serial interface. Connect the GPS to pins 0 and 1 of the Nano and use Serial1 to communicate with it
The Serial port does not use pins 0 and 1 and it communicates directly with the PC so Serial and Serial1 do not interfere with one another
Note that as its name suggests, the Nano 33 IOT operates at 3.3V rather than 5V. It may not, therefore, be compatible with the GPS. Do you have the specification for the GPS ?