Can I switch my service city frequently?

You can change your profile address as often as you want and shortly after saving the change you will show up in searches in your new location. However, changing addresses all the time may not be fruitful in finding clients in the location you want as many clients don't wait until the last minute to book. I see your profile hasn't been approved so you need to think hard and long about the services you offer and where you want to offer them. Best of luck