I would like to close my account once my latest subscription runs out. How do I go about this task and do I need to clean up (delete) my files before closing the account

I see you turned off renewal and you will not be charged again unless you change that. Note your subscription will not run our until November. You can continue as a DelphiBasic member when you are dropped from DelphiPlus.

If you do want to close your account completely, look in your Preferences, Account Status. Once the account is closed, any files will stick around unless you remove them first. You may also want to remove any entries in your Profile.