Yes, you can completely delete your account, just by going into My Account, then selecting Delete Account. All the sales data retrieved until then will be wiped out, together with all your personal / company information. Please note that this action is irreversible.

Also note that if you delete a paid subscription you won't receive a reimbursement for the remaining period already paid for. What you could do is delete your account just before the automatic renew date. Or you could downgrade to a smaller subscription plan - in this case the unused credit for the current plan will be used for the new plan and you won't loose any money.