Yeah...just ask the moderators to close the thread when your thread has reached whatever you consider to be your limit of replies to your thread.
I've seen many members have their threads closed when the thread author thinks the thread has run its course or they think the thread has gone too far off course from the theme of the thread.
There should be some kind of button for the original poster to close his/her thread when they wish to.
Like a purple or maroon or orange or red round button that says Abort/Close. 2018ET,