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this is from the Help link:
A simple message to us with the request to close the account is all that is needed.
You know, you don't HAVE to leave. An option to consider: Perhaps you could put your account on Vacation Hold for a while, and then come back and activate your account when you are able to participate again. It may be a viable option for you, especially if you anticipate that you could come back here before a year has passed. (Vacation Hold isn't really a good option if you cannot check in at least one time during a year. After a year of inactivity, the automated system kicks in to start to close down an account (credits forfeited, etc.)
But, if you don't want to leave and you could check in once in a while, you could put your account on Vacation Hold and not need to worry about it, and then come off of hold when you could participate here again.