I suggest keeping the account as you never know when you will want to play again, even if just for a bit.
To make sure you REALLY want to quit. Give all your droppable shit away to random noobs in shit gear in the noob camps. Then bind your self in a death loop in some interesting place. AFK for a few hours.
If you can make it all the way to level 1 with out feeling bad about it, then you were ready to quit. Delete the toon and go on with life!
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