Jehovah's Witnesses do not provide a dignified resignation process for members who wish to resign/quit being a Jehovah's Witnesses.You are not given any good choices. You can either: disassociate yourself,fade,become inactive or move to another city/state/country where you won't be bothered or found out.
If you quit your job/employment, stop attending a book club or bowling league,or quit a lawn service company, newspaper delivery service,you wouldn't see your employer or friends sending out a written notice to anyone to stop all association with you or have little contact.You would sue them for slander.You have a right to quit any association or contract (when it expires or doesn't meet the terms any longer) whenever you wish.
What would you like to see the Watchtower Society implement that would give you a dignified way to leave/stop being a Jehovah's Witness?