Yes. To pause your GoFi line simply switch to Lifetime plan*. You will suspend the monthly charge and will be able to return to GoFi plan at a later time. Please keep in mind, that if you switch plan, you will lose the remaining data on your balance.
*If you switch to Lifetime plan your GoFi Europe USA data does not transfer over. Your Line will be automatically refilled with 1GB of data according to the prices specified.