I think you shouldn't delete your account. If you feel you want to leave this site, you can stop visiting. But months or years later, you might decide to visit the forum again, and certainly some people will still remember you.
A lot of nice people here have just suddenly gone by deleting their accounts at some point. It was nice meeting you here, so please don't make sudden emotional decisions too quickly.
If you want you can just take a vacation from the site