BeaverEater.
Welcome to the Forum a great place to explore various points of view on jw stuff.
In my opinion, do not bother with a letter as your no longer being a witness will be read out.
Seems you are simply fading and no longer active.
Take my tip, let it be, that way friends and family will not be required to shun you.
They will occasionally work on you to 'return to their desert god' but I'm sure you could deal
with that now and then.
Enjoy the freedom from constant guilt tripping.
jtg