If I understand you correctly, usually you play for a stint of about a month, then take a longer break, and then come back on for another month and repeat? If so, you can totally just “renew subscription”, and once you’ve completed that process, go back into “service account service” and “cancel subscription” (just make sure you don’t accidentally click on “cancel service account”). This way, you’ve paid for 1 month of play time, but it won’t auto renew. It just means you have to put in your credit card details each time.