First things first, it breaks our hearts a little to hear you want to close yourself off. But, if this is what you choose, then go to the Settings section of your app and deactivate your account.

Or you can turn off the auto-renew to pause your recurring plan if you are looking for a break. Your eSIM and account will then automatically deactivate after 6 months of inactivity… but the memory of you will live on forever.