Sorry to see you go. May I ask why you are leaving? At any rate RajratnaS1's directions is what I was going to say but no need to repeat it here :).

Here's a good video that explains how to cancel membership. Cancel Wealthy Affiliate Membership and Stop Billing Hope you reconsider.

Hi, to cancel your membership, go to your profile >>account settings >> subscription >> membership >> click on “Stop and cancel membership “ and you’re done.
Hope it will help you. Thanks